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Copper is reddish brown, like a penny. A way to test it is to clean it with a mixture of salt and vinegar, which makes the metal a brighter color.
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A way to test whether your metal is aluminum is to drag a key along its surface. It should dent without much pressure.
Stainless Steel is shinier than steel.
Specifications: The vehicles must not have fuel tanks, and you must demonstrate Vehicle Title.
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