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In page Tannin:
"There was a collapse in the vegetable tannin market in the 1950s–1960s, due to the appearance of synthetic tannins, which were invented in response to a scarcity of vegetable tannins during World War II. At that time, many small tannin industry sites closed.[2] Vegetable tannins are estimated to be used for the production of 10–20% of the global leather production.[citation needed]
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