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In page Sulfuric acid:
"A wide variety of laboratory syntheses are known, and typically begin from sulfur dioxide or an equivalent salt. In the metabisulfite method, hydrochloric acid reacts with metabisulfite to produce sulfur dioxide vapors. The gas is bubbled through nitric acid, which will release brown/red vapors of nitrogen dioxide as the reaction proceeds. The completion of the reaction is indicated by the ceasing of the fumes. This method conveniently does not produce an inseparable mist.[citation needed]
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