Tertiary color if they exist at all, though indigo and scarlet are standard for blue–violet and red–vermilion. In another sense, a tertiary color is obtained by mixing secondary-colored pigments. These three colors are russet (orange–purple), slate (purple–green), and citron (green–orange), with the corresponding three quaternary colors plum (russet–slate), sage (slate–citron), buff (citron–russet) (with olive sometimes used for either slate or citron). Beyond that are shades of grey (blue grey and brown greys), which approach but never quite reach black. The RYB color terminology outlined above and in the color samples shown below is ultimately derived from the 1835 book "Chromatography", an analysis
Indian red (color) Diderot in 1765, alternate names for Indian red included "what one also calls, however improperly, English Red." The source of this color is: ISCC-NBS Dictionary of Color Names (1955) – Color Sample of English Red (color sample #15). At right is displayed the color kobe. The color "kobe" is a dark tone of Indian red, made like Indian red from iron oxide pigment. The first recorded use of "Kobe" as a color name in English was in 1924. Indian red (color) Indian red is a pigment composed of naturally occurring iron oxides that is widely used in India. Other shades