When refining scrap gold the acid is what contains all your gold.
Once you pour off the acid you will want to collect anything that is left over. Rinse the pieces that are not dissolved At this point you are also able to recover any gem stones that were in the jewelry, diamonds etc as the acid does not harm good stones.
These can be sold or reused. Next you must neutralize the nitric acid witch has partially been done by heating the acid but is best done by adding Urea/ Uric acid...and yes its urine and yes urine does work.
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