Which one is a Colour?

White

I say they are both colors. They are both in the crayon box, 🖍

White and black are both considered colors in art and design. White reflects all visible light; black absorbs it. Scientifically, they aren’t colors of light, but context matters.

They’re both colours and it can also not be a colour depending on what context you’re using them

It all depends on in what context in my opinion.

Technically black isn’t a color because it lacks light, while white is considered a color because it’s made up of all spectral colors.

White, black is the absence of light and light is needed to reflect color.

In Physics, white is the reflection of all light, and black is the absence of light, but in art, they function as colors. This is according to google. 

Black or white is not a color. White is a presence of visible light, and black is the absence of light. Though for artistic content they are both considered colors.