Red + orange = red-orange. With more red you get scarlet; with more orange, deep orange.
Red + orange, in equal parts, make red-orange. With more red it leans toward scarlet, and with more orange, toward deep orange.
Half and half makes red-orange. 2 parts red to 1 part orange gives scarlet; 1 part red to 2 parts orange gives deep orange.
Add white little by little to lighten it (light red-orange) or a little black to darken it (dark red-orange).
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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