
Because we research indigo for our books and more, we tend to write about indigo, instead of Prussian Blue. However, as we continue to focus on dyes, it is important to include Prussian Blue, an extremely popular dye of the 18-19thth century. Prussian blue was “invented” in 1704 by Henrich Diesbach in a laboratory. I used quotations around the word “invent” because it was actually a mistake made when trying to create the red color of Florentine Lake. The inventors quickly retraced their steps to create one of the more popular blue pigment and dyes. Prussian blue was much easier to work with in textiles than indigo and could be used in a variety of printing processes. Sadly, it does turn brown if exposed to heat or in the presence of alkalis. So, one way to...