Colour wheel
The
colour wheel consists of the primary colours—red, yellow and blue, and the
secondary colours—green, orange and purple (or violet).
Generally
speaking, reds, oranges and yellows are warm colours and greens, blues and
purples are cool colours.
Part of the difficulty in mixing watercolour paints arises from the fact that there isn't a "hue neutral" pan colour for each of the primaries–red, yellow and blue. Some are close, but most have a colour bias, or leaning, toward some other colour.
The
purest, most intense mixtures come from combining two primary colours that lean
toward (are "biased" toward) the same secondary colour.
The more
colours you mix together, the greyer and less pure your mixtures will become.
Colours that are opposite each other on the colour wheel (like red and green,
for example) will also neutralise each other when mixed, and make a greyish,
brownish colour. Try always to mix the colour you want using no more than three
colours. Start with the lightest of the two colours, and add the darker one to
it, a little at a time, until you get the result you want. Remember that
watercolour dries lighter, so what you see in your palette should be a deeper,
more saturated mix to compensate for this.
Experiment with some colour mixing
Here are
some suggestions:
French ultramarine or ultramarine
blue mixed with permanent alizarin crimson or thalo crimson. These two colours
both lean toward violet, so will give you the 'purest' purple mixtures.
French
ultramarine or ultramarine blue mixed with Winsor lemon. These two colours will
give you good greens, but because the blue leans toward purple (has a little
red in it), the greens aren't 'pure'.
Permanent
alizarin crimson or thalo crimson mixed with Winsor yellow. These two colours
give you the least pure, intense oranges because they lean toward completely
different colours. If a quieter, duller orange is what you want, use these.
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