Color theory is the guide by which color is mixed and organized. The color wheel is the traditional structure for organizing color into three categories: primary, secondary, and tertiary.
PRIMARY
The primary colors are red, yellow, and blue. These three colors cannot be created by mixing other colors. All other colors are a result of blending primary colors.
SECONDARY
The secondary colors are green, orange, and purple. These colors are created by mixing two primary colors. Yellow + Blue = Green. Red + Yellow = Orange. Blue + Red = Purple.
TERTIARY
The tertiary colors are yellow-orange, red-orange, red-purple, ...
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