Hi all,
Already tried gun blue (way to harsh : getting a nasty crust).
Found some "cupric treatment" powder in a plant store (hope it is copper carbonate). Can no longer find ammonia in stores (and lost the one quart bottle that I had) :-(
Also have copper sulfate on hand, muriatic acid, acetic acid (of course), nitric acid (to passivate SS tig welds), sulfuric acid (battery acid) and some other house products like TSP etc...
Is it possible to still buy a bottle of ammonia in a hardware store in the US ? (border is quite close and I go from time to time to pick up my auction purchases).
Any other suggestion (my green dishwashing soap did not work either, nor did the dishwasher soap).
Thanks in advance !
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