Hello everyone, i have cemented out mix precious metals with copper from aqua regia, so far the process is becoming easier for me, after cementing out the copper and the went into the acid to cement the copper i end up with a yellowish orange foan on top, im not sure if it is gold or paladium,
After i burn all the motherboards and gold cobtaining plastic, put it into nitric acid to digest base metals and copper, after digestion is finished i filter the copper nitric solution and put in a piece of item to recover the coper but I noticed a yellowish orange foam that forms afterwards (probably gold) but i know copper cements most of the precious metals
please help
Here i upload a picture
After i burn all the motherboards and gold cobtaining plastic, put it into nitric acid to digest base metals and copper, after digestion is finished i filter the copper nitric solution and put in a piece of item to recover the coper but I noticed a yellowish orange foam that forms afterwards (probably gold) but i know copper cements most of the precious metals
please help
Here i upload a picture