Could a chemist reproduce inks of medieval quality, then apply them to vellum?

[Oscroft]

Just an aside... you can buy a variety of iron gall inks from UK suppliers, some plain black and some with other pigments or dyes added for variety. I have several that I like to use with fountain pens

A note for anyone else considering making ink, as I'd hate my suggestion to lead anyone to ruin their fountain pens... The commercial iron gall inks I have are specifically for fountain pens and contain no binder (like gum arabic). Binder is used in quill/dip pen inks, and those inks should not be used in fountain pens as they can clog. (I expect everyone knows that, but just in case).