Because colourblind people can see them, are black, white and grey technically not colours?

Question: Because colourblind people can see them, are black, white and grey technically not colours?
- Keywords:
- Royal Society of Chemistry: Find out more on:
  
  hue
  
  light
  
  perception
Asked by to Rowena, Roy on 21 Mar 2014. This question was also asked by .
- Rowena Fletcher-Wood answered on 21 Mar 2014:
  
  No! They are degrees od light. We have two kinds of sensors i our eyes… Rods and cones. Cones detect colour but are weaker than rods, which detect level.if light. Have you ever noticed that in poor lighting conditions such as dusk you only see in black and white? I do!

Question: Because colourblind people can see them, are black, white and grey technically not colours?