If you look at a puddle of water, you can see that there is a reflection!
Well if some light is reflecting off of the water, then that means that not all of the light goes through the water, so things will look just a little darker through water.
This reflection happens on both side of the skin between water and air.
When something is wet, it has just enough water to make lots of tiny little Puddles, and that reflection traps some of the light from getting out to your eyeballs.
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