Red Chalk

Red chalk

Red chalk is chalk of a reddish-brown color, which was used as a material for drawing. It is obtained from the red ochre variety of hematite. Another term for red chalk, common in older references, is sanguine. The word comes via French from the Italian sanguigna and is originally from the Latin "sanguis"; it refers to the color's similarity to that of dried blood.

Hunstanton Formation

The Hunstanton Formation is a lithostratigraphic name applied to an early Cretaceous limestone succession in eastern England which was formerly known as Red Chalk. The type section is at Hunstanton Cliff in northwest Norfolk.

Chalk

Chalk is a soft, white, porous, sedimentary carbonate rock. It is a form of limestone composed of the mineral calcite and originally formed under the sea by the accumulation and lithification of hard parts of organisms, mostly microscopic plankton, which had settled to the sea floor. Chalk is common throughout Western Europe, where deposits underlie parts of France, and steep cliffs are often seen where they meet the sea in places such as the Dover cliffs on the Kent coast of the English Channel.

Red

Red is the color at the long wavelength end of the visible spectrum of light, next to orange and opposite violet. It has a dominant wavelength of approximately 625–750 nanometers. It is a primary color in the RGB color model and a secondary color in the CMYK color model, and is the complementary color of cyan. Reds range from the brilliant yellow-tinged scarlet and vermillion to bluish-red crimson, and vary in shade from the pale red pink to the dark red burgundy.

red chalk

Noun

1. An indurated clayey ochre containing iron, used by painters and artificers; reddle.