I have already poured the molten mixture in water and proceeded to the nitric acid boil, but when the boil was completed there was no gold flakes just black mud. Thoughts on this. The burn dish has residual left after melting the gold and silver.Looks pretty normal to me, maybe slightly lumpy indicating it probably didn't get fully alloyed.
Heat the dish gently and slide the button out using a graphite rod or sterling silver/SS utensil.
Buff the dirty button off with a wire wheel in your grinder (be gentle, not too aggressive).
If it's smooth and uniform color proceed to nitric acid, if not proceed as stated below.
Flux your dirty dish with copious soda ash to clean out the residues.
Place the buffed button back in the dish and melt again with a flux mix of equal parts of soda ash and borax, pouring off the dirty flux while the button is fully molten.
Repeat as required.
Steve
Where did it come from?I have already poured the molten mixture in water and proceeded to the nitric acid boil, but when the boil was completed there was no gold flakes just black mud. Thoughts on this. The burn dish has residual left after melting the gold and silver.
If your inquarted material is 25% gold, the gold usually holds together in pretty much the same shapes it was in before the nitric leach. If it was much below 25%, the gold can break apart and leave you with mud. It can still be quite clean, but it is more difficult to wash and decant.I have already poured the molten mixture in water and proceeded to the nitric acid boil, but when the boil was completed there was no gold flakes just black mud. Thoughts on this. The burn dish has residual left after melting the gold and silver.
Put in AR and boiling for 1hour of the black mud. Thoughts?You're already half way there. Dissolve it in a minimum amount of AR, then drop it. Of course, follow all the standard steps of cooling, diluting, filtering, washing, etc.
Dave
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