In my study of the Ripley Scrolls and trying to understand how medieval documents were made,
I created a large batch of iron gall ink. Iron gall ink is made from the tannins found in oak galls and iron salts. The recipe for iron gall ink differs depending on who writes it, but the general idea remains that it is a simple ink made from a vegetable dye and a mordant. One thing I discovered about oak galls, aside from the way they grow on trees, is that they differ based on the region they come from. In the image below are Canadian oak galls (top) and Eurasian oak galls (below):
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Fig. 1: Canadian oak galls (above) and Eurasian oak galls (below). All images (c) Alex Margarit.
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