Originally painted "Feldgrau" (field grey), the "Stahlhelm" was often camouflaged by troops in the field using mud, foliage, cloth covers, and paint. Official issue cloth covers in white and grey appeared in late 1916 and early 1917. Camouflage paint was not formally introduced until July 1918, when German Army Order II, No 91 366, signed by General Erich Ludendorff on 7 July 1918, outlined official standards for helmet camouflage. The order stipulated that helmets should be painted in several colors, separated by a finger-wide black line. The colors should be relevant to the season, such as using green, brown and ochre in summer.