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https://www.wirejewelry.com/jewelry-making-blog/2434/testing-real-coral/
Jun 16, 2010 · (For those experienced, nitric acid can also be used.) If it does, then it is real coral. To see if this coral is naturally colored or dyed, rub an inconspicuous area with a rag drenched in acetone. If it has been dyed, …Estimated Reading Time: 2 mins
https://oureverydaylife.com/tell-coral-jewelry-real-14940.html
Lemon Juice and Calcium Carbonate One way to test your coral item is to see how it reacts with acid. Pick a part of your coral jewelry that isn’t easily exposed (say the underside of a ring or inside of a bracelet) and swab it gently with lemon juice to see if …
http://www.bjbead.com/coral/794.html
Jun 16, 2010 · The second is: If the coral jewelry is real, then it will color the milk, when you put the jewelry in the milk at the common temperature for 1 to 2 hours, If the piece is fake, the whiteness of the milk wont changed.
https://www.leaf.tv/articles/how-to-tell-if-coral-jewelry-is-real/
If the coral jewelry is real, it will color the milk. If the piece is fake, the whiteness of the milk will remain unchanged. Another test is to place a drop or two of nitric acid or lemon juice on an inconspicuous place, like the back of a particular piece of jewelry.
http://answers.google.com/answers/threadview/id/551783.html
Aug 05, 2005 · Additionally, Nancy Stacy, a certified jewelry appraiser based in Walnut Creek, CA, has verified that the methods mentioned above would be used by a gemologist to test if the coral …
https://www.youtube.com/watch?v=g9XYpz2a5nQ
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https://www.gemstoneuniverse.com/which-tests-to-identify-real-red-coral-from-fake-coral.php
How to identify if a Coral has been dyed? The simplest method is to dip an ear bud with acetone and rub an inconspicuous area of the Coral. If it has been dyed the dye color will attach to the cotton bud. The same can be done using a piece of white cotton cloth. The ultimate test for identifying Genuine Red Coral
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