This pigment is a highly brilliant orange shade of Naphthol red, a monoazo pigment. It was first patented in 1939, but has only been in use since around 1975. This particular grade of Naphthol red has been made to have much higher than usual opacity compared to other red pigments of this chemical group. This opacity increase is partly the reason why it performs at the top of its class in lightfastness rating. These types of pigments are rated as having very good lightfastness in general, however this particular grade performs at the top of its class, only moving down from excellent to very good in samples which have been made with pale tints using titanium dioxide pigments. This pigment has outstanding flow properties and brushability. This pigment is often used as the main pigment in blends that replicate the colour and opacity of cadmium red pigments in “cadmium red hues”. The colour is cleaner than cadmium red of the same hue, and its tint strength is very high. It is an economical pigment. Although exposure to outdoor environments will negatively effect its lightfastness, this pigment will outperform cadmium red. Cadmium red should not be used in outdoor exposure.