What is "feldgrau"

Feldgrau has been the official basic color of military uniforms of the German armed forces since the early 20th century until 1945 or 1989 respectively. However, according to the color code there was no exact scientific definition, so slightly different grey tinctures were possible. Armed forces of other countries selected slight timbers or shadows of that color according to the German Feldgrau. Metaphorically, feldgrau used to refer to the armies of Germany (the Imperial German Army and the Heer [en: ground forces, or army] component of the Reichswehr and the Wehrmacht).