Iron gall ink
Iron gall inks are a special type of permanent ink. In addition to dyes, they also contain iron gall, which reacts with the paper and thus cannot be washed out. This also causes the ink to darken and become grayer as it dries.
Here is an overview of our iron gall inks. Some have only a very small proportion of iron gall, others a higher one, which makes these inks even document-safe according to DIN standards.
