Complimentary colours are at opposite sides of the colour spectrum. One way to learn about locating and mixing these colours is to make your own colour wheel.
Next, consider the twelve colours from Chevreul’s colour circle and lay each colour next to its opposite or complimentary on a grey ground. Try to match the darker tone to the lighter by adding white.
Make mixtures of each pair of complimentary colours. Make a note of the colours mixed and describe the resulting colour. this is another way of creating broken or tertiary colours.
Look closely at the effect that complimentary colours have on each other and try to explain this in your notes.
NB Observations are noted next to examples.