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In this video, I have come across several types of man made turquoise which are more or less untestable via the traditional methods (hot needle and acetone dye test).
This is a follow up to my other two turquoise testing videos here:
• How to Test Turquoise ...
And here:
• Fake Turquoise vs Hot ...
I also answer some of your questions about which liquids can also be used to test for dye.
Chapters:
00:00 Testing new stones for dye
04:46 Testing stones with the hot needle
10:36 Testing using new liquids
14:16 Summery and Speculation