A spectrophotometer is an instrument used to determine the colors of light a pigment absorbs and transmits.
We do have different kinds of spectrophotometers available in the market , which can be used to determine any colour changes ( fading away ) in painting, photographs, textiles etc. over a period of time.
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A spectrophotometer being used
to determine if the colors
used in an art exhibit are fading.
See the image on the left.
Image source: http://www.lcsd.gov.hk/CE/Museum/Conservation/specialties_equi_spectrophotometer.htm
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