Orange + purple = reddish brown. With more orange you get terracotta; with more purple, plum.
Orange + purple, in equal parts, make reddish brown. With more orange it leans toward terracotta, and with more purple, toward plum.
Half and half makes reddish brown. 2 parts orange to 1 part purple gives terracotta; 1 part orange to 2 parts purple gives plum.
Add white little by little to lighten it (light reddish brown) or a little black to darken it (dark reddish brown).
The result is similar. Watercolor looks lighter because the white paper shows through; acrylic gets a little darker as it dries.
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