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Research team claims to have found evidence Lake Cheko is impact crater

By on August 31, 2019

first_img Citation: Research team claims to have found evidence Lake Cheko is impact crater for Tunguska Event (2012, May 21) retrieved 18 August 2019 from https://phys.org/news/2012-05-team-evidence-lake-cheko-impact.html (Phys.org) — Early on the morning of June 30th, 1908, a huge explosion occurred in a remote part of Siberia near the Podkamennaya Tunguska River. So great was the blast that trees were knocked down in neat rows for nearly a thousand square miles and the sky lit up from parts of Asia to Great Britain. What caused that explosion has never been firmly settled. Most researchers agree that it was the result of either a comet or meteoroid, with most leaning towards the former due to the lack of both an impact crater and meteoroid fragments. Now however, a research team from Italy says that they have found proof that it was in fact a meteorite that struck the Earth and that a nearby lake is the impact crater. They have published the results of their findings in Geochemistry, Geophysics, Geosystems. For years, amateurs and professionals alike have debated the cause of the Tunguska Event, as it’s come to be known as. Some suggest it was the work of extraterrestrials while others say it was god’s way of getting our attention. Serious scientists, on the other hand, have suggested its most likely cause was a comet melting and then vaporizing as it hit, leaving no real evidence behind. Unfortunately, that theory doesn’t hold up very well in light of the fact that scientists have found differences in the levels of carbon, nitrogen and isotopes of hydrogen and iridium, from the surrounding area which are similar in some respects to those found with certain asteroids. Also, tiny particles that sort of resemble meteorite components have been found in the wood of the fallen trees. None of this evidence can rule anything out however as it could mean there was a comet that had some rocks in it or a meteorite that vaporized due to a soft composition.The Italian teams says it was a meteorite and claim they have proof of their assertion in the form of an as yet uncovered piece of something tangible beneath the sediment at the bottom of Lake Cheko; a shallow funnel shaped lake approximately five miles from where most believe was ground zero for the explosion.The team came to this conclusion after performing seismic measurements on the lake bottom in 1999 which showed that sentiment had been building for just about a hundred years, which would of course put it close to the Tunguska Event and also gave evidence of something dense near the middle of the lake.Further evidence came to light they say in 2009 when they returned to the lake and performed a magnetic survey, which they say showed an anomaly in the same location as their seismic measurements had detected. Now, after three more years of studying evidence they collected from the site, they’ve concluded that Lake Cheko is indeed an impact crater and that the dense object beneath the lakebed is the smoking gun.Others of course aren’t so sure, and likely will remain pessimistic until someone digs up the object and studies it, proving it to be nothing more than a regular rock, or an object from space that left an impact crater as it struck over a century ago, finally solving the mystery. Researchers say Tunguska Event was an UFO Crash: Debris of Alien Spaceship found More information: Magnetic and seismic reflection study of Lake Cheko, a possible impact crater for the 1908 Tunguska Event, Geochemistry, Geophysics, Geosystems, VOL. 13, Q05008, 12 PP., 2012. doi:10.1029/2012GC004054AbstractA major explosion occurred on 30 June 1908 in the Tunguska region of Siberia, causing the destruction of over 2,000 km2 of taiga; pressure and seismic waves detected as far as 1,000 km away; bright luminescence in the night skies of Northern Europe and Central Asia; and other unusual phenomena. This “Tunguska Event” is probably related to the impact with the Earth of a cosmic body that exploded about 5–10 km above ground, releasing in the atmosphere 10–15 Mton of energy. Fragments of the impacting body have never been found, and its nature (comet or asteroid) is still a matter of debate. We report here results from a magnetic and seismic reflection study of a small (∼500 m diameter) lake, Lake Cheko, located about 8 km NW of the inferred explosion epicenter, that was proposed to be an impact crater left by a fragment of the Tunguska Cosmic Body. Seismic reflection and magnetic data revealed a P wave velocity/magnetic anomaly close to the lake center, about 10 m below the lake floor; this anomaly is compatible with the presence of a buried stony object and supports the impact crater origin for Lake Cheko. Explore further © 2012 Phys.Org Image: Geochemistry, Geophysics, Geosystems This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.last_img read more

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First rifle constructed from printed 3D parts by gun enthusiast in Canada

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first_imgThus far, as can be seen in demonstration videos, guns produced by 3D printers aren’t nearly of the same quality as those produced by professional arms makers—the printed rifle in the video, for example, isn’t much better than one made from a copper tube and fired by striking with a hammer. What appears to be the reason for concern, of course, is what the future may hold. Higher quality guns printed by ordinary citizens would not only be untraceable, they could be made of materials that could easily pass through metal detectors at airports and other public venues. Worse perhaps, might be the government’s inability to stop the process—laws enacted to prevent the creation, distribution or downloading of blueprints would be exceeding difficult to enforce as would preventing the printing of the product at a private location. A man known as “ThreeD Ukulele” on YouTube has posted a video that shows him (or a colleague) test firing a small rifle (named the “Grizzly” after a Canadian tank) that he claims was constructed by parts he printed on a 3D printer. If his claims turn out to be true, it will mark the first known instance of a rifle being constructed in such a way. Explore further In the video, a man can be seen affixing the barrel to the rifle (which appears to be made of a white plastic) then exiting off-screen to fire the rifle from a safe distance via string tied to the trigger. The man then returns to view after the shot has been fired to inspect the condition of the rifle. He reports that the .22 caliber bullet fired successfully but a portion of the barrel split as did the receiver.Printing guns using expensive 3D printers has been in the news of late after a man who goes by the name Cody Wilson created blueprints for printing a handgun which he claimed he had personally test-fired. Since private citizens are not allowed to own such weapons in Canada, ThreeD Ukulele (aka CanadianGunNut on the DEFCAD forums) modified the blueprints for the “Liberator”—the name Wilson gave to his printed gun. Small arms rifles are allowed for hunting of small game in Canada, so CanadianGunNut added a longer barrel. He’s one of the lucky few that have access to a 3D printer—a Stratasys Dimension 1200es where he works and is allowed to pursue personal projects as well. Files posted online to ‘print’ working handguncenter_img © 2013 Phys.org Citation: First rifle constructed from printed 3D parts by gun enthusiast in Canada (w/ Video) (2013, July 26) retrieved 18 August 2019 from https://phys.org/news/2013-07-rifle-3d-gun-enthusiast-canada.html This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.last_img read more

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Researchers find short tracks of DNA may aid in regulating human gene

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first_img Journal information: Science Advances Citation: Researchers find short tracks of DNA may aid in regulating human gene expression (2015, July 27) retrieved 18 August 2019 from https://phys.org/news/2015-07-short-tracks-dna-aid-human.html Decaying RNA molecules tell a story Scientists have known for some time that the mechanism that controls protein translation, known as polyadenylate A aka, poly(A) is sometimes interrupted, causing degradation of messenger RNA (mRNA) and the proteins under development, leading to some ailments such as neurodegenerative diseases. Past research has suggested the problem lies with amino acids involved in the encoding, but now it appears that the problem is actually with the RNA itself—specifically strings of multiple adenosine (A) nucleotides.In this new effort the team, noting that approximately 2 percent of genes in the human genome may be impacted, found that in studying bacterial ribosomes, that they were more likely to be interrupted on strings of lysines if they were encoded by AAA codons, as opposed to AAG codons. They showed that making shorter or longer runs of adenosine nucleotides, without modifying amino acid sequences, changed the protein output and also the stability of the mRNA. They noted also that doing so also sometimes led to the creation of what they termed “frameshifted” protein products.The researchers also studied poly(A) tracks in human cells and found some as short as just nine basses long might influence gene expression. They discovered that poly(A) lowered the expression of protein in two different ways. The first was by halting translation, which led to degradation of the protein and mRNA itself. The second was when frameshifts occurred during translation, which led to early termination of the production of proteins.The work by the team, and another also at Washington University looking into the impact of nucleotides on Poly(A) offer a fresh insight into the creation of disease-causing states in cells and by extension, possible ways to prevent it from happening, offering patients with such ailments hope of recovery. © 2015 Phys.org DNA double helix. Credit: public domaincenter_img More information: Translational control by lysine-encoding A-rich sequences, Science Advances  24 Jul 2015: Vol. 1, no. 6, e1500154 DOI: 10.1126/sciadv.1500154AbstractRegulation of gene expression involves a wide array of cellular mechanisms that control the abundance of the RNA or protein products of that gene. We describe a gene regulatory mechanism that is based on polyadenylate [poly(A)] tracks that stall the translation apparatus. We show that creating longer or shorter runs of adenosine nucleotides, without changes in the amino acid sequence, alters the protein output and the stability of mRNA. Sometimes, these changes result in the production of an alternative “frameshifted” protein product. These observations are corroborated using reporter constructs and in the context of recombinant gene sequences. About 2% of genes in the human genome may be subject to this uncharacterized yet fundamental form of gene regulation. The potential pool of regulated genes encodes many proteins involved in nucleic acid binding. We hypothesize that the genes we identify are part of a large network whose expression is fine-tuned by poly(A) tracks, and we provide a mechanism through which synonymous mutations may influence gene expression in pathological states. Explore further (Phys.org)—A team of researchers with members from Washington University, Johns Hopkins School of Medicine, the Howard Hughes Medical Institute and the Polish Academy of Sciences has found that problems with RNA appear to be behind protein translation interruptions and that short segments of DNA may assist in regulating gene expression. They have published a paper describing their research and findings in the journal Science Advances. This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.last_img read more

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The treasure trove

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first_imgThe genius of jewellery-making in India over the past five millennia will shine through a gallery that is opening in the National Museum (NM) this Friday (7 November). It will showcase varied aesthetics of ornaments across the class, gender and age of the wearer. Alamkara, which features a total of 255 jewels housed in 25 glass cases, will also throw light on techniques of moulding some of the ornaments integral to ancient, medieval and modern history. Also Read – ‘Playing Jojo was emotionally exhausting’There are also exhibits showing the flora and fauna used in ornamentation, while there is a separate section on amulets. Overall, the attempt is to bring to light to some of the ornaments that have survived the times in different parts of the country. Union Minister of State for Culture and Tourism Shripad Yesso Naik will inaugurate the gallery that will give the visitors a peek into ornaments that bear the stamp of regal splendour as well as the ones used in common households. Also Read – Leslie doing new comedy special with NetflixCurated by frontline jewellery historian Usha Balakrishnan, the permanent gallery housing necklaces, bracelets, pendants, bangles, earplugs, needles and girdles, among others, will make National Museum  the country’s largest repository of jewellery.  The 1949 founded institution did have a similar section till a decade ago when it was closed and the objects moved to a vault inaccessible to the public. NM Director-General Venu V said, ‘The comeback of the gallery was a long standing demand of   heritage lovers, as it was one of the most popular galleries.  The objects have now increased in number and also become better in quality. ‘The catalogue of spectacular objects includes hair ornaments, plaques, marriage pendants, armbands and belts. The ornaments at Alamkara are suggestive of the sense of beauty of the regal classes to common folk over the years’.last_img read more

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Satav still IYC chief but new team on the cards says Cong

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first_imgThe hunt for a new Youth Congress chief has begun with the term of incumbent president      coming to a close and Rahul Gandhi seeking to make the party fighting fit after its Lok Sabha polls debacle.“Satav continues to be the Youth Congress president but he has requested for a new team including a new president, as the term of his team is over,” AICC secretary Sooraj Hegde said.Dismissing as “not true” the speculation that Satav has been dropped from the post, Hegde said that the incumbent IYC chief is participating in the process of finding a new team. Also Read – Need to understand why law graduate’s natural choice is not legal profession: CJIHe also dubbed as “baseless” suggestions that Satav’s replacement was being thought of after his organising the Caravan programme.Satav said he had expressed his desire to relinquish his charge so that “new blood comes in”.He said that he had resigned from the Youth Congress two years back as well but was asked to continue.Satav is a Lok Sabha member from Hingoli constituency in Maharashtra, where the party could secure only two out of 48 seats.Congress vice-president Rahul Gandhi has introduced the system of elections in Youth Congress and NSUI ending the nomination culture soon after he took charge as AICC general secretary in 2007. Also Read – Health remains key challenge in India’s development: KovindGandhi now oversees all frontal organisations of Congress including Mahila Congress and Seva Dal while playing a key role in decision making in the parent party.Though doubts were expressed in certain quarters of the party about the internal election process in Youth Congress, indications have it that the same will continue.In the past, the office-bearers of Youth Congress and NSUI were nominated by leaders of Congress party till Gandhi introduced internal elections in these bodies.The leadership, has, asked state youth Congress leaders to send in names for the next national chief of party’s youth body.Recently it was decided that the State Congress Presidents will have the power to nominate and promote office-bearers, an attempt to strengthen their authority.last_img read more

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PM has lunch in Parliament canteen pays Rs 29 for thali

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first_imgAround 18 MPs were having lunch, sitting in small groups on different tables, in Room Number 70, when Modi landed there at 1 PM. The room on the first floor of Parliament building is for MPs.The Prime Minister greeted the MPs. Some of them came to introduce themselves to him, according to the canteen staff. Then he sat on a table, already occupied by three MPs and ordered food.”Anything special, sir,” canteen in-charge B L Purohit asked the Prime Minister. Also Read – Need to understand why law graduate’s natural choice is not legal profession: CJI”No, I want normal vegetarian thali,” Modi replied. He also ordered fruit salad.Immediately, a thali, consisting of palak sabzi, rajma, dal and salad, was served along with rice and a tandoori roti.”The total bill for the food was Rs 29. He gave a note of Rs 100 and I returned Rs 71,” said waiter Rama Shankar who attended on the Prime Minister.He did not ask for bottled water and drank RO water, staffers said.He was there for about 20-25 minutes. Two of the MPs on Modi’s table were from Gujarat. Union Minister Piyush Goyal also joined in after some time. Also Read – Health remains key challenge in India’s development: KovindRealising that it was a “historic” occasion, Purohit requested the Prime Minister to write in a ‘Suggestion Book’ which he presented to him.”Anna data, sukhi bhav (Blessings to the one who feeds),” wrote Modi in Hindi and signed it.According to sources in Parliament, this was the first time any Prime Minister had lunch in the canteen as a customer.Rajiv Gandhi had once eaten in the canteen but not as Prime Minister, the sources said.last_img read more

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Capturing moments and moods

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first_imgIndia International Centre hosts an exhibition of black and white pictures titled Hola Mohalla by Jagdev Singh. It celebrates the unconditional love and faith of people in their guru. The show will be inaugurated by Sundeep Misra, author, sports writer and filmmaker. For Singh, photography is a medium of creative expression. He loves to capture the moments and moods from people’s daily life and especially concentrates on street and travel photography. His work untangles the complex appearance of life, revealing a fine sense for a moment to pause. His photos carry a refined essence of people and life at large.  Also Read – ‘Playing Jojo was emotionally exhausting’Hola Mohalla is a three-day event, celebrated at the shrine of Keshgarh Sahib in the Sikh holy town of Anandpur Sahib in Punjab, every year in the month of March. Hola is the masculine form of the feminine sounding Holi. The word Mohalla implies an organised procession in the form of an army column. It was here in 1699 that the tenth Guru, Guru Gobind Singh Ji, baptised five men and founded the Khalsa Panth, which is the modern day Sikh faith. Hola Mohalla originated in the time of Guru Gobind Singh Sahib Ji, who held the first such event and celebrations at Anandpur Sahib in February 1701. Also Read – Leslie doing new comedy special with NetflixThereafter, people come in millions from all over the world to participate in the celebrations. The main attraction of the celebrations is the procession by Nihangs, tent pegging and bareback horse-riding and performance of ‘Gatka’ (Sikh martial art). One gets to see several Nihangs sporting massive turbans with Sikh symbols. Hola Mohalla rejuvenates the centuries old tradition and zeal of sheer faith and belief that the tenth Guru play amongst all the people present, much to the joy of millions. When: May 22 – 28 Timing: 11 am to 7 pm Where: Art Gallery, IIClast_img read more

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Im now ready for Bollywood Mumtaz Sorcar

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first_imgAce magician PC Sorcar Junior’s youngest daughter, Mumtaz, who has appeared in 30 films in seven years, is a boxing freak. In fact, it is her love for this sport which has her pretty excited about her big release Guru. Another film scheduled to hit the theatres this May is a Bengali feature, Raktakarabi, based on Rabindranath Tagore’s dance drama. Mumtaz, who loves cooking and dancing when she is not shooting, is also working for two new Tamil films this year and says that she is now ready take up more roles in Bollywood. Also Read – Add new books to your shelfMumtaz, tell us about your first big release of 2017, Guru…. My first big release this year will be Guru, the Telugu remake of a hit Tamil film directed by Sudha Kongara, Irudhi Suttru. The Hindi version was the critically acclaimed Saala Khadoos. Guru is the story of two women boxers who are in fact sisters and the changing dynamics of their relationship. The coach is played by Venkatesh. The sisters come from a poor family and their father is a fishmonger. I’m playing the elder daughter, who gets into boxing because she wants to land a job in the Police force to support her family. The younger one is a natural wrestler and under a good coach, who even lands the World Cup. At one point, sibling rivalry separates the duo but they come together again. I am into boxing and so I could play the part since the whole film is about professional boxers. Also Read – Over 2 hours screen time daily will make your kids impulsiveYou also have a big Bengali film to be released this year, Raktakarabi…. Yes, for the first time, Rabindranath Tagore’s ‘Raktakarabi’ will see a celluloid version. I play the role of Nandini but then it is a modern interpretation. The central character Nandini is a revolutionary, just as Tagore had conceived her but the times have changed. Raktakarabi is a political film, a reflection of our times. Bishu Pagol has been assayed by Kaushik Sen in Raktakarabi and the musical score has been done by Debojyoti Mishra. Raktakarabi’s most celebrated stage version was Bohurupee’s 1954 production, with lead characters played by the legendary Sambhu Mitra and Tripti Mitra. This is your second Amitava Bhattacharya film….Yes, last year, I assayed the very difficult role of Chitrangada in Bhattacharya’s maiden film, titled Conditions Apply. That film was based on the life story of Chitrangada, a eunuch whose true identity gets exposed and how society treats her after they get to know that she is not a woman. Chitrangada connects with herself but goes through a period of deep turmoil. In a way it is the most difficult role that I have assayed till date. The film was meant for the festival circuit. On Bollywood…There are offers. Recently, there was an offer for a commercial film but I wasn’t ready at that time. I wanted to be sure, to work on myself first. Now that I’m better than what I was and have some acting experience of working in different cities, I’ve matured as a human being. Most of these regional films gave me new units and different languages to deal with. I was the only Bengali there and I thought people expected something from me, as the representative of Bengali cinema. I’m now ready for Mumbai. You are known to be a workout addict, how do you relax?Right now, I’m taking physiotherapy because of a small back injury which I got while working for Saala Khadoos though I never stopped acting. At the moment, I’m not working out fervently. Otherwise, I exercise everyday under the guidance of coach Ranodeep Maitra. As for relaxing, we are one big happy family and we have a lot of fun when all of us – especially the three sisters – are together. We all have different careers and are busy during the whole day, but we usually get together for dinner and exchange notes. I also love cooking and my bakes are pretty famous in the family circuit. Plus, we have three pets – two Mastiffs and a stray one – who I adore.last_img read more

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Victims of the System

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first_img“Umesh from UP was falsely accused of molestation by his neighbour aunty when in reality it was a property dispute. When the cops did not find any evidence or grounds against him, they did not probe further into the matter but then the woman went to some senior police officer and asked for action to be taken against him. Umesh felt so harassed, he committed suicide.” While the rest of us strive to achieve reforms and raising the status of women, we totally forget the ‘male’ gender. They are neglected, labelled and their problems are not taken into consideration, because how can men have problems? They have it easy, we assume. This gender antagonism has led a lot of people wrongly interpreting the cause of feminism. What’s more, male-bashing often leads to internet subcultures where critiques of feminism mix with hostility towards women. Also Read – Add new books to your shelfDeepika Bhardwaj, a male activist, has sparked a change all across India with her TedxTalks and her documentary ‘Martyrs of Marriage.’ Her cause that started as a result of a familial problem has now led to a nation level awareness programme. Her documentary features men from parts of India and their voices are given a platform to open up. Approximately, 90,000 married men committed suicide in 2016 alone – this is not an ignorable number. ‘Section 498A of the IPC deals with a non-bailable offence which applies to a husband, or relative(s) of a husband, of a woman, who is/are subjecting her to cruelty.’ Made with the right intentions to protect women from being harassed, it is being majorly misused and has become a tool in a woman’s hand as she can easily frame her husband and his family to gain anything from them. Every man convicted in this case is treated the same way by the police. Also Read – Over 2 hours screen time daily will make your kids impulsiveIf a woman is found guilty of falsely accusing her husband and his family, she has to pay a penalty of Rs10000 or Rs100 and it’s bailable. Most cases would just be closed. In majority of these cases they’ll accept the case, question the woman, and ask the man to take the case to court. If the woman is found guilty, the judge can prosecute her and initiate proceedings against the woman which is a rare case. In rape cases, we are seeing some progress. “I know of a case where a woman from Ludhiana, met a Delhi man on Facebook, just one week before her husband committed suicide. Then two weeks after her husband’s burial, she and her online ‘friend’ went to Rajasthan after she came to visit him in Delhi. What happened after that was surprising. After coming back she filed a rape case against him, claiming he drugged her. Now the man is in jail, fighting for innocence with laws that already biased against him,” said the documentarian “What these laws essentially do is they hide what’s really happening in our society. And to put the cherry on the cake, there is dowry and harassment, which is usually seen as something that happens to women and not men. These are the clothes you just throw over the real big problem, to underplay it. The truth is, marriages are falling apart, extra-marital affairs are happening so easily, people have no patience,” added Deepika.When asked if she is a feminist, she exclaimed, saying she wasn’t because she thinks the modern interpretation of the word just puts her off. She believes the women who graduate from prestigious colleges, celebrities, the ‘feminists,’ who call the shots are super bigoted and they send the wrong message to the others.”People call me a male activist but I am just a film maker, I just show the truth and make movies, I am just a story teller and know the right from wrong. If you look at me just as a human being, I am just trying to do something that I saw and thought was right,” said Deepika.On being asked about receiving any political support, she said, “All politicians are the same when it comes to these issues; they all want to play it safe. This is not anybody’s concern because it’s not on anybody’s agenda. It’s the backlash that they are afraid of. People are very skeptical when they are powerful because they don’t want to lose their position.”She did not start with a plan but now she has a lot of plans which however, don’t come with a deadline but after the screenings of her documentary, Deepika is going to work on more projects to spread the word on male harassement. Several issues in this space need to gain attention and be changed. The day she can stop even one person from being framed in a false 498 A case, she’d have done it all and can finally rest.last_img read more

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Ways to take care of your precious gold jewellery

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first_imgGold being a soft metal, contact or abrasion between different jewellery pieces may damage them. Wrap each piece separately to avoid such a problem, say experts.Here are some ways by which you can keep your expensive gold safe and make it last longer:4Don’t wear your gold jewellery while bathing or cleaning: There are chemicals in soaps and other cleaning agents. Exposure to these chemicals can dull your gold.4Store it separately: Gold is a soft metal. Contact or abrasion between different pieces may damage them. Wrap each piece separately in a soft cotton cloth and try hanging up the gold chains. Also Read – Add new books to your shelf4It needs occasional buffing: Though the jewellery may not need cleaning yet but buffing or rubbing your jewellery with a soft chamois cloth can help restore the shine of the piece immediately.4Cleaning tips: Mix mild dish washing detergent with water.Soak your jewellery. If the piece has stones avoid soaking, use a soft cotton cloth dipped in the cleaning mixture and wipe down carefully.Rub the pieces with hand or cotton swabs one at a time. You may also use a children’s soft toothbrush for heavily ornamental pieces with numerous crevices. Make sure to use the brush extremely gently.Rinse with warm water to remove all the suds and dry with a soft cloth or leave it out to air-dry overnight.4For jadau jewellery: For your precious gold-based jadau jewellery, an eraser can be used to wipe off marks that develop over time. It is not a very good idea to use water on jadau jewellery since humidity may leave the jewellery rusted.ianslast_img read more

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