I remember my art teacher fifty years ago in Tulsa looking at an oil painting on display at the Tulsa County Library and exclaiming to her teacher husband,....”OH MY GOD! HE USED BLACK!”
I did not know black was “verboten” in art work till that moment.
It is generally better to use a very dark color to using actual pure black. Black can be used to darken, but there is seldom good reason to put pure black on a painting, as almost nothing you would be painting would be or appear to be such.
Black paint apparently creates issues for oil painting