What color do you paint nitrogen lines?

IF i understand correctly... an attempt was made to tint the paint with food color?... well, dont. If the food coloring is water based, and so is the paint, you're fine, or oil with oil, but anything...

White and black.

The answer is white. However, yellow might be added to a color as well to make it lighter, but it might change the original color. Also, when you add white to a color it is called "tinting" the...

dollops of pink, a hint of blue and black (to make purple)

Paint is all white before pigment is added