smb

I have approximately 1kg of PC2 RAM with IC Chips embedded on both sides. I sliced gold fingers and separated IC Chips. I created Aqua Regia with 375ml of Hydrochloric Acid. and 125ml of Nitric Acid for melting the gold fingers. A day after, I filtered the Aqua Regia and added around 20g of smb...

Hello Every one i hope you doing great i have Gold residue from the polishing process i dissolve it in AR and precipitate it with smb but i don't know if need to add more smb to the solution what i should do in this case