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