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