Offered by four major oil paint manufacturers as a single-pigment color. The lightfastness for this color varies widely according the supplier. It would be advisable to do lightfastness tests if it is a color you like to use. From some pigment suppliers the lightfastness is excellent, and for others it is merely moderate. Williamsburg describes their version as, "Strong, somewhat sour, tomato-like red orange," and cites the ASTM I rating.
However a word of caution is needed. Though it was previously thought to be of low concern for toxicity, Monona Rossol's work mentions that this is one of the pigments which may metabolize to cause a condition called methemoglobinemia-- please consult her work on pigments for more information.
