I am a Assistant Research officer at Gem & Jewellery Research & Training Institute ,Which is a government Body.
These days I am practicing with bleaching for some opaque stones for them to get cleaned from other minerals and materials from their surface and cracks.
I have selected HF, Acetone,Aqua Regia,and Hydrogen Peroxide.
If anyone knows the correct concentration of these bleaching agents for the best practice.
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