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Do you mean, achieving a gradated color set with washes? The easiest way is to start out with a colour that is brighter than what you would like, paint it on flat, let it dry, and then repeatedly wash on a darker shade until you achieve the desired amount of shadows.
Alternatively, if you've painted up in layers, deep shadow, shadow, main colour, highlight, accented point of light, for example, but you have not really blended the layers of paint at the edges, you will have a nice, shading effect, but it will be segmented and a bit awkward. A wash over the whole area can help to unify the colours and will visually, if not technically, blend the whole area.
I'm not sure if that is what you were asking...?
Also, the link darefsky posted seems to be a very thorough description of two-brush blending, or plain old blending, as non-modelers seem to call it. I don't think it answers your exact question, but blending paint is something everyone should play around with.
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