I am having a problem with 14k white gold turning black during
heating, and my pickle having no effect on cleaning it. I read an
archived thread from someone having a similar problem, but I think I
am already doing all the things that were given as advice.
I clean the pieces in the ultrasonic before heating, I pre-flux in a
mixture of denatured alcohol and boric acid, I use battern’s flux,
and Sparex pickle in a heated crockpot, which I have increased the
concentration of three times. No matter how long I leave it in the
pickle, it comes out just as black and/or copper coated. I am sure
there is no steel contaminating the pickle, and I do not use my steel
tweezers for putting pieces in there. The only other thing I can
think of is that I use an oxy/acetylene torch, which I know burns
dirtier than the other gas combos. Could that be it?
Any -(more)- advice???