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<p>[QUOTE=&quot;2manybooks, post: 3101457, member: 8267&quot;]True lime plaster, as well as marble, contains calcium carbonate (CaCO3). When tested with hydrochloric acid, you can observe effervescence/fizzing, as the reaction generates CO2. Calcium sulphate (gypsum) and sepiolite do not contain carbonates and will not effervesce.[/QUOTE]</p><p><br /></p>

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