A 'main colour', or a colour that can make other colours. These colours are blue, yellow and red. Red and blue purple, yellow and blue make green and yellow and red make range.
yellow and blue
Green
You would get a yellow-green.
BLUE
Yellow and blue.
GREEN
blue
brown
yellow
Yes, it kinda gets the persian blue colour.
Blue is a primary colour, you can not mix other colours to attain blue.