Not true...mix all colors together...you get black.
Not quite. It depends on whether you're looking at Artist's prime colours or 'electronic'/printing colours.
Cyan - Magenta - Yellow 'mixed' gets black..... Red - Blue - Yellow gets brown.
Back in the 70's studying Architecture we 'decided' BLACK was Architectural.
I really don't like pink..... except FF.00.FF aka 'Magic pink' - THE thing for skinning transparencies....
I see a red door and I want it painted black...............................................