Red + blue = purple. With more red you get purple-red; with more blue, violet.
Red + blue, in equal parts, make purple. With more red it leans toward purple-red, and with more blue, toward violet.
Half and half makes purple. 2 parts red to 1 part blue gives purple-red; 1 part red to 2 parts blue gives violet.
Add white little by little to lighten it (light purple) or a little black to darken it (dark purple).
The result is similar. Watercolor looks lighter because the white paper shows through; acrylic gets a little darker as it dries.
With light, like on a screen, colors add up: red and blue make magenta.
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