Cadmium sulfide is used as a yellow pigment. Cadmium yellow is the name of the pigment. If selenide is added during the roasting process (seen above in "preparation" section), it can make an orange or a yellow pigment. Cadmium sulfide is a good pigment because it does not break down easily, is very bright, and does not react with air like other pigments can. It is toxic, though. 