While various oranges can be mixed with yellow & red, a single pigment orange can offer more vibrancy and create cleaner mixtures. Apart from natural orange ochres, the only orange pigments available to artists of the ancient world were highly toxic. The development of Cadmium colours in the 19th Century brought new options for orange pigments, and by the mid 20th Century the modern synthetic organic pigments, including Benzymidazolone & Pyrrole oranges, expanded the possibilities even…