mould growth. after the use of pentachlorophenol and quicksilver (mercury base) biocides and their derivatives was forbidden vegetable tanning vegetable tanning uses tannin (this is the origin of the name of the process). the tannins (a class of polyphenol astringent chemical) occur naturally in the bark...
mould growth. after the use of pentachlorophenol and quicksilver (mercury base) biocides and their derivatives was forbidden vegetable tanning vegetable tanning uses tannin (this is the origin of the name of the process). the tannins (a class of polyphenol astringent chemical) occur naturally in the bark...
mould growth. after the use of pentachlorophenol and quicksilver (mercury base) biocides and their derivatives was forbidden vegetable tanning vegetable tanning uses tannin (this is the origin of the name of the process). the tannins (a class of polyphenol astringent chemical) occur naturally in the bark...