That’s not entirely true. Colour is light. You see colour when light hits your eyes. Light can be emitted, like by a light bulb, or reflected off of objects. Different colours of light are reflected in different proportions by different objects.
Black is what you see when little or no colour hits your eyes. In practice, this means you see black when 1) There’s no light, or 2) Something is reflecting almost none of the light that hits it (aka absorbing all light)
White is the opposite. It’s what happens when all light hits your eyes **at equal strength, and high concentration**. In practice, this means you see white when 1) There’s a lot of all kinds of light, or 2) when something in the environment is reflecting all kinds of light equally.
Now, to answer what Grey is:
Grey is a mix between White and Black. Grey is what happens when something is reflecting all types of light equally, but not in high amounts. It’s literally a darkened white, or a brightened black.
This is why you can’t create what looks like a black or grey coloured lights. It would just be a dull source of white light.
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