Gold needs a special acid cocktail to dissolve
You cannot just toss a gold ring into standard acid and expect it to melt away like a cheap movie effect. Gold is incredibly arrogant and inert, stubbornly resisting almost all single corrosive agents. It requires a highly specific cocktail of nitric and hydrochloric acids, menacingly named aqua regia, just to coax the stubborn metal into finally breaking down.

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