Cadmium Orange Deep is a blending of Cadmium Red with Cadmium Orange. Cadmium reds and oranges have been used by artists for 90 years and in that time have gained a reputation as the gold standard for these sort of colors. It is a reputation well deserved, especially in the early days when only genuine vermilion could compete on permanence (but at the cost of being very poisonous) and the organic pigments of the day were very much less permanent. In recent times organic pigments like the quinacridones have caught up to the cadmiums in terms of permanence and the pyrroles are at least as good if not ever so slightly more permanent and yet the cadmiums still hold the crown.
Chemical Description: Cadmium selenosulphide
Pigment Numbers: PR108 PO20
Lightfastness Rating: ASTM I
Pigment Opacity: Opaque
Paint Opacity: Opaque