How can we know why things turn darker when they wet?

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The discussion centers on understanding why materials appear darker when wet, with a focus on conducting experiments to explore this phenomenon. Participants suggest that simply pouring water on a cloth is insufficient for a thorough investigation. It is recommended to take photographs for analysis and to test various materials, as different substances may exhibit different effects. One proposed explanation involves diffuse reflection, where water alters how light reflects off a surface, potentially affecting perceived brightness. Experimenting with water depth or different liquids could further illuminate the reasons behind this visual change.
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I have searched for the experiment (like how to do it) related to how we can know why things turn darker when they wet and found nothing. All I found is the conclusion and it's not what I'm searching for. If i just pour some water on a cloth and sum up the experiment it doesn't seem right... Anyone please kindly helps me?
 
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Do you look for an explanation, or for a way to conduct an experiment?
princezephyr said:
If i just pour some water on a cloth and sum up the experiment it doesn't seem right
Why not? Make photos to analyze them, test different materials (not all will show the same effect).
 
One paper proposes that diffuse reflection from the material is internally reflected off the surface of the water (so less is available to reach your eys). If that's the cause then perhaps increasing the depth of the water or using a liquid with a different critical angle would make a difference to the brightness?
 

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