Green and purple: What Color Do They Make?

Blue-gray

Green + purple = blue-gray. With more green you get gray-green; with more purple, dusty purple.

More shades from the same colors

Gray-green2 parts green + 1 part purpleDusty purple1 part green + 2 parts purpleLight blue-grayblue-gray + whiteDark blue-grayblue-gray + black

Start with the lighter color and add the other one little by little: the darker one usually takes over.
Does it look dull or muddy? One of the two contains a bit of a third color. Try purer paints.

What color do green and purple make?

Green + purple, in equal parts, make blue-gray. With more green it leans toward gray-green, and with more purple, toward dusty purple.

What ratio of green and purple should I use?

Half and half makes blue-gray. 2 parts green to 1 part purple gives gray-green; 1 part green to 2 parts purple gives dusty purple.

How do I make blue-gray lighter or darker?

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

Is it the same with watercolor, acrylic and oil?

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