Since we are recovering gold foils from trimmed circuit board fingers we know we have fiberglass, gold and copper. It is safe to say the blue color in the liquid comes from the dissolved copper under the gold plating. I figured this out when funneling the liquid into 1 gallon milk jugs. All I had was a metal funnel with a stainless steel screen in it. It immediately produced a result by dropping copper on the screen.
So my first genius idea was to boil down the solution and concentrate it. Then add aluminum to drop the copper. But since my hotplate failed on me I only had one of these. It did not work fast enough. On to plan two.
Dump it all into a 5 gallon bucket and add a scrap of aluminum. This is only after an hour and the liquid is close to clear in color. Also a heavy vinegar scent coming from the liquid.
This will be filtered and the copper will be melted.
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