Apedia

A)   Etc Is   To Opaque

Front (a) ... 
glass
https://www.macmillandictionary.com/dictionary/british/glass
liquid
https://www.macmillandictionary.com/dictionary/british/liquid_1
 etc is 
difficult
https://www.macmillandictionary.com/dictionary/british/difficult
 to see through
Back opaque

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