Crossword clue: the dark red dried juice of certain plants, used variously in tanning, in dyeing, and as an astringent in medicine.
1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
East Indian tree yielding a resin or extract often used medicinally and in e.g. tanning