Colour/color

Seven are the colours,in the Rainbow.
we have an acronym VIBGYOR.
Violet, Indigo, Blue, Green , Yellow,Orange and red.
Bluish purple colour is Violet.
Some flowers have this colour.
Blue & violet mixed colour is Indigo.also a deep Blue dye got from plants.
You can see the sea on a sunny day.
It will look blue.
And you can see the colour of the sky Blue on a clear day.
The colour between Blue and Yellow in the spectrum is green.
Leaves grass are of green colour.
You can see yellow colour in the yolk of a hen' egg.
[OR] you can find the colour of the Gold as yellow.
The colour between yellow red is orange.
Orange is fruit which is juicy.
Some green become yellow when days pass by.
Colour of fresh blood ,Rubies ,human lips.
Maple leaves in Autumn, postoffice pillar box,
Are red in colour.
How do we get the Black colour?
why don't we see the white colour
In the rainbow?
What is white in colour?