Art teacher?

I am cleaning and sorting and painting and trying not to lose my mind in the SEA of trash and plaster that is my classroom and a contractor pokes his head through my door shouting," Art Teacher?" I look up all blown out and say "yes??"
"yea, How do you make black?"


I smile.
" It's all colors"

He shakes his head." oh i thought it was purple and green."

So then i explain that that IS mixing all colors and he grins and runs out shouting like a ten year old, " I KNEW IT!"