Cadmium orange is a modern pigment which was not used very often in oil paintings. Its composition is similar to cadmium yellow and cadmium red.
Pigment - Wikipedia
Dalnavert, in Yellow — Dalnavert Museum
Cadmium red - ColourLex
Pigments by type - ColourLex
Cadmium yellow - ColourLex
Cadmium orange - ColourLex
Cadmium yellow - ColourLex
Timeline for orange pigments - ColourLex
Orange Pigments - ColourLex
Jackson Pollock, Alchemy - ColourLex
Sustainable Chemistry, Free Full-Text