Gasoline fumes curdling the lacquer. These are not lined tanks, most bike tanks aren't, so were the paint meets the fuel...paint damage. It's normal. You might want to peel it off so it doesn't flake and end up in the tank. Some have removed it and painted with epoxy.
Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats.
H. L. Mencken
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