Green and black: What Color Do They Make?

Green + black, in equal parts, make dark green. With more green it leans toward moss green, and with more black, toward dark olive.

Half and half makes dark green. 2 parts green to 1 part black gives moss green; 1 part green to 2 parts black gives dark olive.

Add white little by little to lighten it (light green) or a little black to darken it (dark green).

The result is similar. Watercolor looks lighter because the white paper shows through; acrylic gets a little darker as it dries.