English: Essences I and II of the self-made iron gall ink with the already mixed ink. These are the final ingredients of homemade iron gall ink. On the left is a solution of iron and vinegar. The iron was (probably) obtained from nails left to sit in the vinegar for a week. On the right is an oak extraction in water; the extraction was performed over a bunsen burner. These two solutions are kept separate until immediately before use. In the brown glass in the center is the ready ink, recently mixed from the two solutions.)