Many dyes and other hair treatments will fluoresce under a certain color (wavelength) of light.In a fluorescence microscope, a beam of light of a certain wavelength is used.If the sample contains particular chemicals, it will absorb some of the light and then reemit light of a different wavelength.This is called:

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Fluorescence is the process where a substance absorbs light at one wavelength and then emits light at a different, usually longer, wavelength. This is the principle behind the operation of a fluorescence microscope.

Many Dyes and Other Hair Treatments Will Fluoresce Under a Certain