Things You'll Need
Paint brush or mixing stick
The value of a color refers to how light or dark the color is, and it is easy to change the value of any color you like. If you find yourself with a shade of green that isn't as dark as you want, there is no need to return to the paint store; adjust the color yourself.
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Place the amount of green paint needed for your project on a paint palette.
Add a small amount of black paint to the green and mix thoroughly with a paint brush or mixing stick. Your green paint will become darker.
Add more black paint and mix thoroughly again until you reach the desired shade.
Add black paint a little bit at a time so that you don't create a shade darker than you wanted.
If your paint becomes too dark, add more green to lighten it.
A color wheel is a useful tool to have when mixing paint.