A colorless crystalline compound, C7H 6o 5, derived from tannin and used as a tanning agent, as an ink dye, and in photography and the manufacture of paper.
一种无色结晶酸，C7H 6o 5，从丹宁酸中提炼而得，用作鞣剂、墨水染剂及摄影和纸张制造。
A colorless crystalline compound, C7H 6o 5, derived from tannin and used as a tanning agent, as an ink dye, and in photography and the manufacture of paper.
一种无色结晶酸，C7H 6o 5，从丹宁酸中提炼而得，用作鞣剂、墨水染剂及摄影和纸张制造。
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