Colour Theory

Monochromatic 

Monochromatic colours usually are all one colour and are close to each other on the spectrum.

Analogous

Analogous colours consist of colours that are next to each other on the spectrum for example blue, green and light green. Colours like this are used to act pleasing to the eye.

Complementary

These usually consist of colours that are opposite to each other on the colour circle for example red and green. Complementary colours are usually used to stand out and are used at high contrasts to add to this effect.

Tirad

A Triadic colour scheme uses colours that are evenly spaced around the colour wheel. They tend to be quite vibrant. Triad colour schemes are carefully balanced and should always include one colour that should dominate the other two.