Long story short-this is research for a piece of fiction. Is there any chemical or reaction, even if otherwise pointless, that would achieve this, besides just painting the gold?
In: 2
Pure gold won’t discolor, but alloys of it might depending on the purity and the other metals you used in the alloy.
This is how we get stuff like “Rosegold” (Gold / Copper)
[“Graygold”](https://turgeonraine.com/product/classic-grey-gold-wedding-band/#.Y5ui8n3MLtQ) is probably the closest thing to a real alloy of gold that could look similar-ish to lead.
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