A modern view on vegetable extract products
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چکیده
They are used and known from the tanners for quite two thousand years (1) by different civilization (Mesopotamian, precolombian...) and till the XIX century mainly into the form of raw, untreated material like bark. Than chemical companies start to increase he yield of tan content by proceeding into extraction with autoclave and spraydrying leading to extract such as Chestnut or Mimosa having more than 70% tan concentration.
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