Capt Nemo
Bronze Member
I just took a look at one of my acid flasks that had HCl/AuCl from stripping plated items. It had about 300ml of solution, but now only has about 100. The solution turned clear and in the bottom are about 300 gold foil flakes about 40 mesh in size. Looks like the solution may have pulled out the sulfur from the black rubber stopper and precipitated the gold. The other stoppered 500ml flask is still deep yellow.
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