However, we never see colours like black, white or grey in rainbows. According to a report published in Science Report, "but there are two colours we would never see in a rainbow - black and white.

Why doesn’t the rainbow have colours like black, brown and grey in it? – Ivy, aged four, Kent, UK. Many of us have seen rainbows in the sky once the sun starts shining again after a spell of rain.

On the other hand, white is a combination of all the colours together. When light is refracted by raindrops it separates the white light out into the visible spectrum, meaning it is no longer white.