How is the color black formed?

How is the color black formed?
Light is made up of 7 colours, Red, Orange, Yellow, Green, Blue, Indigo and Violet. So when light reflects off, say, an orange book, the colour orange is reflected back into your eyes and the orange book absorbs all the other colours, making us see orange.
When we see black, no light is reflected. All the colours are absorbed so no light is reflected back into our eyes, making black.

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