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.
Zinc yellow - ColourLex - Art and Science
Sulphur - ColourLex - Art and Science
Pigments by type - ColourLex
cadmium yellow – Cultural Heritage Science Open Source
Projects - Page 4 of 6 - ColourLex
Timeline for orange pigments - ColourLex
orange - ColourLex - Art and Science
Mastering Color Series - The Psychology and Evolution of the Color YELLOW and its use in Photography
Cadmium red - ColourLex
yellow - ColourLex - Art and Science
Synthetic colorant - Wikipedia
Week 1: Explore Yellow and Pigment Origins
Sustainable Chemistry, Free Full-Text