Blue + purple = indigo. With more blue you get ultramarine; with more purple, violet.
Blue + purple, in equal parts, make indigo. With more blue it leans toward ultramarine, and with more purple, toward violet.
Half and half makes indigo. 2 parts blue to 1 part purple gives ultramarine; 1 part blue to 2 parts purple gives violet.
Add white little by little to lighten it (light indigo) or a little black to darken it (dark indigo).
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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