One of the mysteries of the English language finally explained.
1rare Any of various black liquids used in dyeing; specifically a solution of lead acetate used as a mordant; also called iron liquor; (now rare).
2A liquid residue containing lignin compounds and inorganic chemicals, formed when pulpwood is heated in alkaline solution in the kraft papermaking process.
Early 18th century; earliest use found in Whole Art Dying.
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