Pretty much anything you like.
The three primary colours, red, yellow and blue, each have a complimentary colour. The complimentary colour of red is green, that of yellow is purple and that of blue is orange. You may note that each complimentary colour is a mix of the other two primary colours. E.g. Complimentary colour of red is green, because green is a mix of blue an yellow, etc.
Yellow
kelly green
oyster
Contrasting and complimentary colours are the same thing. Green is a secondary colour. You achieved a secondary colour by mixing two of the three primary colour. In this case green is the mixture of Yellow and Blue. The complimentary colour to a secondary colour is the primary colour not used to create it; in this case the complimentary (or contrasting) colour to green is red.
When you mix complimentary colours (colours opposite one another on the colour wheel) you will get a brown or black.
You would mix it with yellow, it's complimentary colour. Whenever you want to make the colour brown, just mix it with a complimentary colour. (Purple + Yellow, Red + Green, Orange + Blue.)
=two colours which are on oppersite sides of the colour wheel and when mixed make a neutral colour like red and green are complimentary coulours and when mixed make brown.=
Black Oyster Pearl
The colour of the emerging beam of light will be white because yellow is a complimentary colour and every hue has a complimentary colour when added to it will result in white.
Yes .. Yes they are as they are opposite on the colour wheel.