try the polarized glass trick. look for a strain pattern with polarized glass, such as sunglasses and camera lens. look at the tank and turn your head 90 degrees and if it's tempered, the pattern will show up like in a car window.
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try the polarized glass trick. look for a strain pattern with polarized glass, such as sunglasses and camera lens. look at the tank and turn your head 90 degrees and if it's tempered, the pattern will show up like in a car window.
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