Tannins: classification and definition.

@article{Khanbabaee2001TanninsCA,
  title={Tannins: classification and definition.},
  author={Karamali Khanbabaee and Teunis van Ree},
  journal={Natural product reports},
  year={2001},
  volume={18 6},
  pages={
          641-9
        }
}
The name ‘tannin’ is derived from the French ‘tanin’ (tanning substance) and is used for a range of natural polyphenols. Since ancient times it is known that certain organic substances have tanning properties and are able to tan animal skins to form leather. Prehistoric tribes already knew about the tanning of protective animal hides with brain material and the fat of the killed animals. However, precisely what happens to the skin during the tanning process was only elucidated during the… 

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