re: How many named colors do we need? I say 13 tops

You can name a color whatever you want, but as most kindergarteners learned we only need the three primary colors to make any outer color, or white.

“The three additive primary colours are red, green, and blue; this means that, by additively mixing the colours red, green, and blue in varying amounts, almost all other colours can be produced, and, when the three primaries are added together in equal amounts, white is produced.”