You know what it looks like… but what is it called?
TAKE THE QUIZ“color process”
We have one entry that includes the term color process.
lost-color process
noun: a technique of pottery decoration found in Central and South America and involving the covering of areas with wax before dipping in dye so that on subsequent firing the waxed areas lose the applied color and revert to the original color
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Merriam-Webster unabridged