Why colored cloth seems to be darker when it's wet?

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Offline RyanGuyardo

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It's obvious when we sweat in colored shirt, especially light colored one. why don't white nor black have the same obvious effect?

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Offline lightarrow

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Why colored cloth seems to be darker when it's wet?
« Reply #1 on: 13/11/2010 15:19:30 »
A water layer reduces the "effective" refraction's index of the surface; this reduces reflectivity and so the material appears to have more colour "saturation", that is the colour is less mixed with white (incident) light.

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Offline lightarrow

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Why colored cloth seems to be darker when it's wet?
« Reply #2 on: 13/11/2010 15:20:38 »
A water layer reduces the "effective" refraction's index of the surface; this reduces reflectivity and so the material appears to have more colour "saturation" and darker, because the colour = light reflected back is less mixed with white (incident) light.