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Posted

If we mixed fine sands of rainbow colours we would have a sort of whitish sand.

 

Actually, you would get black - it is the difference between additive (light) and subtractive (pigments) colour mixing.

 

How can we be sure when we see a colour it is a pure colour?

By using a spectrometer to measure it, I guess.

Posted

I've spent a few entertaining hours looking at colour and light on the web, its not an easy subject by any means. Like a lot of science it gets tricky when you probe. I supose its the nature of the beast.

I discovered the different colours travel at different speeds in glass. A most curious fact and yet in a vaccum they all travel at equal speeds.

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