Chemlab for fishies. The fish enter the sandblast tent and are stripped of all contaminants and oxidation. With the surface sand-scoured, all imperfections show up and I put in some last fidgets with welding and chasing- then back in the tent for a follow up visit from Dr.Sanders. The surface glows a muted gold, but is as vulnerable to the air as a ginger to the high desert sun. Like a base-tan with sunscreen, they need a chemical etching that bites into the bronze then goes inert allowing a skin of protection. The fish go black with this initial etching layer, but it allows other chemicals to safely react to the surface and bring out other colors. The fish will go blue-green (Cupric Nitrate and Zinc Nitrate) with hints of dun yellow and yellow-green (a few drops of Ferric in the solution), while the hoops will turn a rich brown with white in all the recesses.
Patina builds up with chemicals and heat, layer after layer. Control of the process is partly knowing when you haven’t gotten there yet with knowing when to stop, all the while blending out areas that come on too fast and bringing up areas that seem to never get there. There is quite a bit of alchemy to it, as it is a mad science.
I cleared the only chem shop in the valley of their Cupric Nitrate, a trace of 100g- or about not enough for one fish. They ordered more, it should have been in last Thurs/Fri, it wasn’t. I’ve used my reserve stash for the first 4, and have just the 100g left for this last pair which will never make it. The fish will have to set overnight and see if the order arrives tomorrow- not a hardship on the human to wait as temps peaked out at 98 degrees.