What about red and orange? Do these count as two? Is orange a shade of red or is it separate because yellow is mixed in?
Viewing post in Question for Challenge 4 colours or less?
I think you're taking it to another degree. That would be like saying, Red, Yellow and Blue are colours and everything else is a shade because they make up from the three primary colours being mixed. The definition of shade is not what you've defined so I'm not sure how you arrived at orange being a shade of red. I don't think the definition of colours is in dispute. As Mana said, Red and shades of red, ie; dark red, or light red are considered shades of red.