What is Prussian Blue and what is its function?

Prussian blue, namely ferrocyanide, is a coordination compound.

Prussian white belongs to Prussian blue compound. Prussian white contains high sodium, and Prussian blue contains only one sodium, which is white, so it is called Prussian white.

Blue is the most basic color in the universe. As the artist yves klein said, photography captures the images of everything in the universe, so blue becomes the most basic color in the photographer's lens.

There is no more unique process than the production process of Prussian blue. If it weren't for fate, it would take a very difficult theory to invent Prussian Blue. Jean-Elo, a French chemist, revealed the mystery of Prussian blue in one sentence.

1704, Heinrich Disbach, a German chemist, made a red pigment in the laboratory, and due to accidental pollution, a dark blue precipitate was obtained.

This blue precipitate was originally a pigment with excellent performance, and was finally named Prussian Blue.

Born in 1842, the photographic imaging process-blue day method, formed Prussian blue. The blue color formed by this monochrome photographic printing process is calm, deep and tense.