General Knowledge
Which two colors make purple?
- Red and blue
- Blue and yellow
- Red and green
The answer is Red and blue.
Complementary colors are pairs of colors which, when combined or mixed, cancel each other out by producing a grayscale color like white or black. When two highly chromatic complementary colors are placed next to each other, they create a strong contrast. Complementary colors may also be called "opposite colors".
Wikipedia · Complementary colors