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why only mercury is used in plain mirror .
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Before 1940,mercury was the most commonly used metallic coating for mirrors because mercury has spread evenly over the surface of the glass and did not tarnish . The practice was eventually abandoned,b because mercury seals in the toxic liquid.today mirror manufacturers use aluminium instead of mercury......
I hope this answer is help ful for you....
I hope this answer is help ful for you....
sanam3348:
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