How does a black and white video from the past get colourized when technology back then processed in black and white?

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Let’s say in the late 1800’s to early 1900’s, videos were only played in black and white. How is it now that they can be colourized? Is it a matter of people adding colour to the videos that may or may not be their actual colours or did cameras capture colour too?

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Anonymous 0 Comments

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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