One of the most versatile of the Bob Ross colors is Alizarin Crimson. It is frequently used in dark mountain mixtures for underpainting. Perhaps most notable, however, are the stunning purple and lavender shades created with this color. 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 TechniqueŒs. No other paints can accomplish what these do, and every batch is individually tested for perfection.