When red and cyan light overlap, they produce white light due to their complementary colors combining.
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Mixing cyan and red in the light spectrum will produce white light. Cyan is a combination of blue and green, and when mixed with red (which is opposite of cyan on the color wheel), the three primary colors of light—red, green, and blue—combine to create white light.
Cyan toner absorbs red light and reflects blue and green light, giving it a cyan appearance. This absorption of red light is what allows cyan toner to create the color cyan when printed on paper.
A cyan object will appear black under red light because red light is absorbed by cyan objects. Cyan is a combination of green and blue light, so when only red light is present, there is no light for the cyan object to reflect or absorb.
Red and cyan light will combine to create white light because cyan is a combination of green and blue light, which, when added to red light, covers all the wavelengths of visible light.
White light minus magenta light would appear cyan in color. Cyan is the complementary color to magenta, so when magenta light is subtracted from white light, the remaining color is cyan.