OUGD404 Studio Brief 01 - How do you read? - The Colour Wheel

The colour wheel - primary, secondary, tertiary and complementary:

Primary:
Used in paint and pigments, primary colours are red, yellow and blue. All other colours are derived from these 3 hues. 

Secondary:
These colours are formed by mixing together primary colours. Green, orange and purple.

Tertiary:
Are browns and greys, they contain all three primary colours and are made by either mixing all three primary colours or a primary and a secondary.

Complementary:
Colours that are opposite one another in the chromatic circle (colour wheel).