The art of colour mixing is mainly a function of temperament and patience.
Complementary colors: the problem
"Along with the idea of “three primary colors” and the fear of mixing “mud” we have another similar old wives’ tale to deal with. This is the idea that there is one type of complementary color which we can use to mix grays and use to place side by side to make the colors pop out thanks to simultaneous contrast. In fact, these are two different sets of complements. If we want to mix a gray we can mix blue and orange, and, if we want to make blue stand out we should not paint an orange passage next to it but a yellow passage."
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