I have a bunch of small copper parts that I want to remove the
patina from (I’ve used ammonium sulfide to darken them). I’ve
read here on Orchid and elsewhere that if you place a sulfide
darkened or tarnished object on a piece of perforated aluminum in
a bath of baking soda and water, the sulfides will dissolve.
Well, I tried this today and lo! it didn’t work. The solution of
baking soda was pretty strong and warm, the perforated aluminum
was clean. Is this all a myth? And if it is supposed to work,
can one of you explain the chemical principle involved? What did
I do wrong??
(I suppose I could go out and spend money on Tarnex or some
commercial cleaner, but it wouldn’t be as much fun.)
Thanks for your ideas -