Muriatic Acid (92ml) in 500ml Bottle 31.45% Hydrochloric Acid used for testing (meant to be diluted). To most geologists, the term "acid test" means placing a drop of dilute (5% to 10%) hydrochloric acid on a rock or mineral and watching for bubbles of carbon dioxide gas to be released. The bubbles signal the presence of carbonate minerals.

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