Colour-blindness comes in a variety of forms, the most common of which being where red and green are simply transposed, this sometimes manifests itself as blue and pink. The extreme and rare version of colour-blindness is where the person can only see in black and white, and although I have met probably only a dozen colour-blind people in my life to date, one was indeed black and white colour-blind.
As for me, it varies. I am what is known as multi-colour-blind. I see the full spectrum, but not necessarily in the right place. Primary colours are usually fine if they are in bright daylight and relatively close, but if the light fades or I go into artificial light I can end up using brown or even black, rather than the green I was looking for! This has never posed a great problem in everyday life: yes, I once bought a maroon jacket thinking it was black and I have left the house wearing different coloured boots - beige and blue. Despite my protests that this was nothing to do with colour-blindness - just late night/early morning syndrome - no one believed me.

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