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I'd like to put down some cardboard for weed control in my garden this year, and the place I work at gets plenty of scrap cardboard that I can use. Problem is, nearly all of our items come from China, including the cardboard. I know the USA and EU have environmental laws that make cardboard from...

...water or oil? I have an amount of mercury, currently stored in a plastic bottle inside of a plastic bag. However after a few months the mercury's surface became gray and dull, I'm guessing from reacting with the air inside. I'm also always concerned about mercury vapors whenever I do open the...