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White light itself consists of 7 colours i.e. VIBGYOR

V - Violet
I- Indigo
B - Blue
G- green
y - yellow
O - orange
R - red

These are the colours which white light is consists of , it can be checked by prism experiment whereas black
itself is not a colour , When there is no light the black colour forms , i.e. you can take example of a room , When there is no light room is dark or black .