Fallen oak in field - advice please!

[Stere]

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The gallotannic acid was usually extracted from oak galls or galls of other trees, hence the name.

 

 

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Commercial tannic acid is usually extracted from any of the following plant parts: Tara pods (Caesalpinia spinosa), gallnuts from Rhus semialata or Quercus infectoria or Sicilian sumac leaves (Rhus coriaria).

 

Seems its a different specific compound rather than general oak tannins?

 

 

 

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Tannic acid is a specific form of tannin

 

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Sometimes extracts from chestnut or oak wood are also described as tannic acid but this is an incorrect use of the term. It is a yellow to light brown amorphous powder.

While tannic acid is a specific type of tannin (plant polyphenol), the two terms are sometimes (incorrectly) used interchangeably. The long-standing misuse of the terms, and its inclusion in scholarly articles has compounded the confusion. This is particularly widespread in relation to green tea and black tea, both of which contain many different types of tannins not just exclusively tannic acid.^[

 

 

 

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Quercitannic and gallotannic acids

Quercitannic acid is one of the two forms of tannic acid^[4] found in oak bark and leaves.^[5] The other form is called gallotannic acid and is found in oak galls.

 

 

 

ref from wikipeadia....

Edited September 30 by Stere