TL;DR it's because of a phenomenon called "total internal reflection" which means (in simplest terms) light can only travel from water into air at certain angles relative to the water surface. Because less light is able to escape from the water, it appears darker.
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@MrRStBedes knows all about this!

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I do indeed. I love Science!
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Interesting. I’m not familiar with elementary optics but I’m sure it did get wetter.
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I have no idea what you are going on about!pic.twitter.com/XOL2rHL7fC
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@Lord_Snore - great page to follow. I have become a fan of this -
Agreed, I too follow this handle
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@smartereveryday this has direct connection to your light/lasers in water videoThanks. Twitter will use this to make your timeline better. UndoUndo
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Ok but now share one on if water is wet
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As the distance of surface particles smaller and osmosis able ~> darker may b due to interferences of light during reflections between these particles such as surface of sand or some fabrics
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