You know what it looks like… but what is it called?
TAKE THE QUIZ“gilder 's”
The following 2 entries include the term gilder 's.
gilder's wax
noun: a preparation of wax, verdigris, and other substances for imparting a tint to gilding by burning off the wax so that the copper from the verdigris combines with the gold
gilder's whiting
noun: whiting ground to medium fineness
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Merriam-Webster unabridged