It's hard to see on this photo but when I woke up my lovely coloured bunting looked white. It was an illusion, it turns out. There was no light source in the room, only the window, so I suppose it's a bit like sitting at the back of an eyeball. In these circumstances, light reflected from objects behind me would then hit the bunting before being reflected back into my eye to show me the colours. This would mean the intensity of this coloured reflected light would be low. However, the white light from the pale cloudy sky was streaming through the holes in the crochet with a much greater intensity. This must be what I saw and why the bunting looked convincingly white.