Baffled with series of events processing transistors...

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I also process electronic waste and only use urea. I always let it settle for a day and the stannous chloride test is negative. Last time, it was in the acid for 3 days because it didn't want to settle and the stannous chloride test was negative even then.
Because the particles are so small.
Boiling it in dilute Sulfuric acid will let the particles agglemorate.

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