I'm doing a little test run on the ink before making a larger batch - and since that involves interesting stuff, you might want to enjoy some pictures of it...

It all starts with the oak galls - in my case, imported ones (which was done in the medieval times as well).



These get crushed, and then they get to soak in water for a few days, with a gentle stir at least once every day.



The next step: Adding iron sulphate - that's the lovely green stuff...



...which instantly turns the brownish liquid black.



And now the whole thing needs to mature again for a few days...