BLACK
Black is the absence of color and is therefore not a color.
A black object absorbs all the colors of the visible spectrum and reflects none of them back to the eyes.
When there is no light, everything is black.
When you are in a totally dark room there are no photons of light.
In other words, there are no photons of colors.
Everything is colorless.
Everything is black.
WHITE
White is a color.
The sum of all the colors of light add up to white.
So white is actually the blending of all colors and is therefore a color.
Light appears colorless or white.
Sunlight is white light composed of all the colors of the spectrum.
A rainbow demonstrates that.
You can't normally see the colors of sunlight except when atmospheric conditions bend the light rays and create a rainbow.
A prism also duplicates the actions of a rainbow by bending the light rays allowing you to see the colors that comprise the )white) light.
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Sorry to disagree but lets get technical...white and black are shades of gray. Gray is a color produced by different refractions or wavelengths of visible light across the entire spectrum, hence the different shades of gray. True Colors in the visible scale are only visible when they are narrow wavelength somewhere within the visible spectrum. Monochromatic photos center on a visible narrow color wave and then widen the bandwidth from there which combines lighter and darker gray shades with the center wave color.