Feldgrau is a green–grey color. It was the official basic color of military uniforms of the German armed forces from the early 20th century until 1945 or 1989. Armed forces of other countries also use
Feldgrau of the Wehrmacht (Stalingrad 1942)
Service dress in Hellgrau (German Bundeswehr)
Austrian service cap in Hechtgrau (pike-grey)
Prussian blue is a dark blue pigment produced by oxidation of ferrous ferrocyanide salts. It has the chemical formula Fe43. It consists of Fe3+ cations, where iron is in the oxidation state of +3, and
Feldgrau
…contingents of the other German states and lastly by the Bavarian Army in April 1916. Formerly most infantry regiments in the German Imperial Army wore Prussian blue tunics, although Bavarian units had light blue and jägers dark green. Cavalry uniforms were of a wide range of colors. Until the outbreak of war in…
The Great Wave off Kanagawa by Hokusai, an artwork that makes extensive use of Prussian blue
Simulated powder x-ray diffraction profile for Prussian blue crystal, crystallographic direction annotated. Image generated using CrystalMaker software.