When blue and yellow are mixed, the resulting colour is green. Red, blue, and yellow are referred to as the main colours. These are the only three colours that cannot be created by combining other hues.
The primary colours, along with black and white, can produce the entire spectrum of colours.
Green is a complementary hue. Secondary colours can be created by combining two of the fundamental colours. Orange and violet are two other secondary hues. The hues of secondary colours are midway between the hues of the two basic colours from which they are derived.
A colour wheel is used to demonstrate the relationship between colours.