Try using Iodine, straight out of the bottle. Still available at
most drug stores Thanks for the help. I am new in this. Please let
me know do I warm up the gold or just apply directly..?.
I just put it on cold, after making sure the metal is clean and
grease free. I begins to darken pretty quickly, and fresh
applications darken it further. Higher karat golds are less reactive.
I’ve not tried warming it, but I suppose that would speed up the
David L. Huffman