I am a jeweller and have found an old recipe for frosting gold (making the gold a richer more yellow colour) and I wanted to ask how stable it is. It is 119ml (4oz)of sulphuric acid, 59 grams (2oz) of potassium nitrate and 7.4 grams (1/4oz) of salt. I just wanted to know if this formula is stable? I need to quench hot metal in it.
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