312 Ultramarine Light

• PB29 ^{●●●●●}

Sodium polysulphide aluminosilicate. In 1828 the chemist Guillemet managed to synthesise the natural lapis lazuli which had been used in ancient times. The variations in shades depend upon the sizes of the microparticles. Producing ultramarine is a fairly complex process, which varies according to the shades being sought. A luminous intense blue (the hue is close to cobalt blue). Produces very cool gradients. Stable in mixtures but contains sulphur, so do not mix with silver white and chrome yellow. Suitable for all techniques.