Why do sticky substances tend to be shiny?

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Any ideas?
 
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First of all - do they?

Second - we like to see you trying to find the answer before helping. That's part of the policy outlined in the forum rules.
 
It seems like a simple enough question: what is the solubility of epsom salt in water at 20°C? A graph or table showing how it varies with temperature would be a bonus. But upon searching the internet I have been unable to determine this with confidence. Wikipedia gives the value of 113g/100ml. But other sources disagree and I can't find a definitive source for the information. I even asked chatgpt but it couldn't be sure either. I thought, naively, that this would be easy to look up without...
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