According to the law of color, which of the following three colors are pure?

• A. red, green, blue
• B. red, blue, yellow
• C. green, orange, violet
• D. blue, yellow, orange

Answer: (B)

Pure color means a hue that hasn’t been created by mixing other colors. In traditional pigment color theory used for paints and nail work, the three primary colors are red, blue, and yellow. These are considered pure because all other hues come from mixing them in various amounts, while the others (green, orange, violet) are mixtures of those primaries (blue+yellow for green, red+yellow for orange, red+blue for violet). So the trio red, blue, and yellow are the pure colors.