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Originally Posted by steve B
They've found some interesting things. Like a certain reddish brown ink that has been assumed to be rust particles in linseed oil somehow includes exactly no iron whatsoever. So much for what's been "known" for over a century!
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Perhaps a Walnut ink of some sort? Not all was iron gall back then. For the average person it was too complicated to make, so many people would grind up bark, walnut husks, or insects, boil it, and then mix it with a binder. No iron sulfate was added.