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https://oureverydaylife.com/tell-coral-jewelry-real-14940.html
How to Tell If Coral Jewelry Is Real Colors of Coral. If you’re curious to know whether your heirloom or recent birthday gift is in fact real coral as... Lemon Juice and Calcium Carbonate. One way to test your coral item is to see how it reacts with acid. Pick a part of... Submerge in Milk. Real ...
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, the color will eventually come off on the rag. Genuine coral is quite rare due to overharvesting in the past.
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. If the coral is real, the spot will effervesce and form tiny bubbles on its surface.
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