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They are known commonly as theoakgallwasps.
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The oak galls are collected, crushed and either boiled or infused in rainwater (or white-wine vinegar).
From theCambridge English Corpus
It is thought that oak galls and copperas may have been used in making the ink on those letters.
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Then inks had to be made from oak galls and other ingredients, and the books had to be hand written by monks using quill pens.
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The other form is called gallotannic acid and is found in oak galls.
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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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They infest certain species of galls, such as those of the blackberry and some oak galls, in large numbers, and sometimes more than one kind occur in a single gall.
From
Wikipedia
This example is from Wikipedia and may be reused under a CC BY-SA license.
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