Not Your Everyday Banana

by Bart Arondson

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The residue left behind when your fingers touch the glass of your lens contains several organic and chemical compounds. Normal skin oil has a pH level of around 4 to 5.5, which is mildly acidic. The longer it is allowed to be in contact with materials reactive with acids, the more reaction will take place. And yes, acid will eat through the coatings on ...

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