Both of the answers here are correct, but also, depending on when the photo (or film) was taken, it actually was “taken” in color, but it was developed in black and white. The cellulose reacted to the wavelengths of light the same way, but transferring the image from the negative to another medium dropped the color out. If the negative is still available, a colorized image can be created. This is an extremely rare and niche example.
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