Unless you have some chlorides or other halides in there, no gold will be dissolved in the sulfuric, period - no argument. The black "tar", or slime, is the gold and, probably, other solids mixed in. It's actually a very fine powder. That's why it looks black to your eyes. Often, once all the black gold slime is removed or settled, the solution will take on an amber color, but not because it contains gold.Im sure the gold has dissolved off the CPUs cause you can see where it has just left the copper and my once clear solution is now gold in color. I tried filtering it through coffee filters and then letting the coffee filters dry and i have a black tar looking substance? This process is kinda new for me so thank you for the help so far.
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