I’m certainly no expert with patinas, but thought I would share my
experience with the same patina compound you used.
I was trying to make a blue patina on copper chain. However, I left
the copper in there too long, and it came out with a heavy bright
blue coat that was almost hairy. I also had spots that were not
covered (that’s because I failed to clean the copper thoroughly
first.) If I had attempted a second patina over the first in order to
get the coverage, it would not have worked. The coverage failed due
to dirt or oil the prevented it from adhering. So, to answer your
question, can you just do it again, “no.” You must remove all the oil
from the metal first.
First, I tried removing the patina with a wire brush, but it left a
lot there in the crevices. Then I tried tumbling it, but that still
left some. Then I soaked it in an acid cleaner, which worked. So,
that put me back at step 1 and cleaned the metal, so it was ready to
try again. I don’t remember why, but I put the thing back in the
tumbler. That gave me 100% perfect patina coverage, because a lot of
the patina was left in the shot, which adhered to the metal perfectly
100% because it was cleaned properly.
It did mess up all following tumble jobs because the shot applied
patina to those items also. I think I’ve tumbled about 20 or so more
times, and have had to clean up each job with acid cleaner
afterwards, but it appears that my shot is now finally clean again.
Lessons learned: 1. clean the metal first with an acid cleaner to
remove ALL oils and other things that can inhibit the patina, 2.
don’t leave the metal in the patina mixture for long without checking
it 3. buy some shot cleaner
Since then I did buy a book on patina, but have not yet played with
it again. I won’t until I get some shot cleaner and a new wire brush
(wore out the first one.)
Sun Country Gems LLC