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Sawdust is your best friend. Any softwood or hardwood sawdust will work. Pine seems to smell the best. DON'T use pressure treated wood sawdust. Put a good layer on top of your melt and leave it there. You need to rouse your melt and work the dross out of the melt and leave the sawdust to turn into charcoal. It will pull impurities like aluminum, copper, zinc etc. out.
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