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Play-Doh is a sculpture medium usually thought of as for children. It comes in several colors. The basic set comes in red, blue, yellow and green. So what do you do if your child is a little more particular and wants other colors to work with? Use the same method you would use to mix paint colors. You can make any color with the three primary colors.
Mix 2 parts red with 1 part yellow. Knead until you have a smooth orange color.
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Pinch off a very small amount of blue and knead it into the orange until the color is smooth.
Continue adding blue until you have the color brown you desire.
Start with small amounts of each color and experiment to get the brown you like best. Red and green also make a nice brown that you can adjust by changing the amount of each color used.