by 
Jodie44
ANSWERS: 5
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Because it asorbs the water so the color gets darker.
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If I remember my Beakman's World right, I think it has something to do with the refraction of the light. But don't write that in stone. (I think it was Beakman's World but it may not have been. lol)
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It has to do with light and refraction. An object made up of several layers interact differently with the light and then the overall perception of colour will be dependent on the overall nature of light received by the eyes from the object. If you have some cotton fabric there are indeed two such layers, one of the loose surface fibers and the second one of the actual surface of cloth. The upper layer doesn't absorb significantly waves of any particular wavelengths, they only scatter the light falling on them. When this scattered light adds up to the reflected light from the opaque object, the result is the perception of a lighter tint. When the layer is removed, like if the cloth is soaked in water, the color is perceived to be darker.
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When the water soaks into the cloth (or paper or whatever) it changes the way the cloth reflects light. That's the simplest answer.
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Answered this question awhile ago. http://www.answerbag.com/q_view/307525 It has to do with light and refraction. An object made up of several layers interact differently with the light and then the overall perception of colour will be dependent on the overall nature of light received by the eyes from the object. If you have some cotton fabric there are indeed two such layers, one of the loose surface fibers and the second one of the actual surface of cloth. The upper layer doesn't absorb significantly waves of any particular wavelengths, they only scatter the light falling on them. When this scattered light adds up to the reflected light from the opaque object, the result is the perception of a lighter tint. When the layer is removed, like if the cloth is soaked in water, the color is perceived to be darker.
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