Poor Man's AR for Ceramic CPUs

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Hi all,

This is the first time for recovering gold from ceramic CPU's, using poor mans AR. I am at the stage now where I have added SMB to the filtered solution. The question I have is, that is it normal to have a ring of very fine black particles at the top of the solution, which is starting to migrate towards the bottom?
 
You left out a lot of inbetweens there but if I follow you correctly, fine gold particles get trapped on the surface and are held up by surface tension. Use a spray bottle of water set on mist to knock them down. Wait until everything settles or it will just collect up there again.
 
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