IR/UV crayons?
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Hi. I am wondering if it is possible to make a crayon, marker, pencil, etc. with the color of infrared, or ultraviolet. Also, do they already exist?
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UV/IR are not colours, they are spectrums of energy. Depending on the type of material used, you could create crayons to reflect/absorb certain parts of these wavelengths.
There are secret writing kits available that use the reflecting concept to turn inks visible when they are exposed to UV light.
There are secret writing kits available that use the reflecting concept to turn inks visible when they are exposed to UV light.
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