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Eyl 26, 2019
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A simple etchant can be made from common chemicals found at local hardware store…

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A simple etchant can be made from common chemicals found at local hardware stores. Hydrochloric acid, also known as muriatic acid, is generally used to clean concrete foundations or patios. A pattern is either transferred or printed onto a 3 1/2-by-5 inch circuit board. The circuit board is made of copper that covers an insulator. Any indelible… #cleaningjewelryremovetarnish




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