phredgreen - thanks!
I was just wondering how best to illustrate my point. Say you go out and buy a new shirt/tie/etc. In the bright lights of the shop it's a lovely orange colour. You take it home, and put it carefully in your (opaque
) cupboard.
Your friend/girlfriend/wife comes round. You tell him/her you bought a new top. He/she asks what colour it is.
Do you say:
a) It's orange.
b) It's black. At least, it's black now. But it'll be orange later.
If (b) is what you do, then fair play to you - but I'd be very surprised; I'd imagine you'd say something along the lines of (a). ie in your everyday use you're prepared to agree that the orange is still orange despite its current larck of illumination...