The brightest of the three Bob Ross yellow colors, Cadmium Yellow is sometimes used to indicate the brilliant sunlight in the sky. More typically, however, Cadmium Yellow is used in conjunction with the other Yellows and Sap Green to highlight trees, bushes and grassy areas. One of fourteen warm clean colors, yielding endless numbers of natural combinations in a smooth yet firm consistency necessary to the Bob Ross Wet-on-Wet TechniqueŒ.