Artists can't use black

Here's about why artist can't use black.

For some reason student artists are told they should not use black. So they end up using too few darks and their paintings often lack strong contrast, punch, or what is sometimes called "eye pop." The no black rule may come from the theory that color mixes are interesting while black is just one pigment. After years of following the no black rule, I now use Winsor Newton's Sepia for a warm black and sometimes make a cool black by adding a Paynes Grey wash over my black ink.