You can make a color wheel with any three pigments you choose, here is a color wheel in which I used secondary colors as my “primaries.” PG7 is the pigment code for phthalocyanine green (yellow shade). PV55 is quinacridone purple, and PO36 is an orangish red called benzimidazolone scarlet. Interestingly, mixing two secondary pigments gives a dull version of the primary color between them. So green and purple make dull blue. Orange and purple make dull pink. Orange and green make dull yellow, or what we normally call brown. Mix all three and you get greys and black. Thinking this way helps is to mix the duller versions of our primaries which are useful for #painting shadows.
I documented many different #color wheels like this in my tutorial on #watercolor triads.
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