Hcl takes up the nickle plating under gold plated pins, takes up tin leaving the silver behind as a sludge small surface caps smaller than fly sheet fall off.
On the first load used electrolysis to plate out the tin, second and third load just used scrap aluminum to recover the mossy tin which is so full of hydrogen bubbles it floats. I add a bit of fresh hcl to replenish the weakened acid.
This leaching process was done outdoors with out heat, If I do this again will make a vessel that can be heated the biodiesel shops sell a nice barrel blanket for this purpose.
Top two images are of the slime's recovered from the bottom of my vessel, bottom image small caps.
On the first load used electrolysis to plate out the tin, second and third load just used scrap aluminum to recover the mossy tin which is so full of hydrogen bubbles it floats. I add a bit of fresh hcl to replenish the weakened acid.
This leaching process was done outdoors with out heat, If I do this again will make a vessel that can be heated the biodiesel shops sell a nice barrel blanket for this purpose.
Top two images are of the slime's recovered from the bottom of my vessel, bottom image small caps.