You know what it looks like… but what is it called?
TAKE THE QUIZ“Delaval”
We have one entry that includes the term Delaval.
Cachou de Laval
noun: a direct dark brown dye for cotton obtained as the first sulfur dye by heating organic materials (as sawdust or bran) with sulfur and sodium sulfide
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Merriam-Webster unabridged
