CMYK or RBY - Does it Matter to Watercolour painters?

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Have you ever had a bright lively painting in mind, but when you painted it the result seemed a little dull?

Or have you tried to mix a nice modern purple only to find you end up with a sort of grey?

It’s not just you.

It could be more about whether you are working with colours based on the CMYK scheme or the RBY schem...