I’m brand new here, and I hope I’m not re-asking a question that’s
already been thoroughly discussed. If it has, feel free to point me
to the relevant material in the archives.
Anyway: I did my first patina yesterday. I’m making a bracelet from
8 segments of 20-gauge copper sheet, and attempted to give them a
blue patina using ammonia and salt water. The results were… well,
less than great. “Failed” may be too strong a word, but only one of
the 8 pieces was completely covered in blue, and only on one side.
The rest had just patches of blue, with generally less than 50%
So I’d like to try again. The main question is, can I just apply
more salt and set the pieces in the ammonia fumes again, or do I need
to remove the patina I’ve got and start over from zero?
The other thing I’m not satisfied with is that I spent a fair amount
of time stamping a texture in the metal, but the patina completely
obscures the texture in most places. Can I lightly polish the piece
(for example, with a green 3M bristle disc) and keep the patina, but
also expose the texture? If that means having patina only in the low
spots, and bare metal in the high spots, I’m okay with that. I can
experiment, of course, but I thought I’d ask as long as I’m here.
Oh, one other thing: does ammonia lose its potency as it evaporates?
Thanks in advance for your insights!