Hi Noel
I gotta say, I can't accept this statement. Left to itself, silver eventually turns black, and never turns back to any other color, so how can the black "not last", especially behind a moonstone? Personally, I think it is a bad idea to use a product that is not meant to be permanent (nail polish) for a permanent application.
What’s wrong with nailpolish? It is basically a very fluid and
heavily pigmented paint. Not permanent? I’ve colorcoded all my needle
files by dipping their tangs in nailpolish just to separate between
cuts. And no, it hasn’t peeled off, abraided nor faded. It is even
fairly resistant to alcohol but not xylene, benzene or acetone. Behind
a stone it doesn’t steal any space and conforms to the surface.
kindly
michaela