The color wheel consists of three primary colors (red, yellow, blue), three secondary colors (colors created when primary colors are mixed: green, orange, purple), and six tertiary colors (color made from primary and secondary colors, such as blue-green or red-violet). As the image suggests, colors that are next to each other on the wheel, such as blue and green, make poor color match since their contrast is similar in both hue and value making it difficult to see. Better color combinations are usually found using colors that are not opposite or adjacent on the color wheel, such as blue and yellow. Black works well with any light color and white coordinates with darker colors. As per the image, yellow and black are a good match because they are different in the contrast of both hue and value.
