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Reference.org
Mulling (spectroscopy)
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<p>Mulling is the process of grinding up a sample into fine powder through <a href="/facts/Mortar_and_pestle/5RDw8Tws">mortar and pestle</a> that is dispersed in a <a href="/facts/Mineral_oil/KjXl9BUo">paraffin</a> for <a href="/facts/Infrared_spectroscopy/u1Hzx617">infrared spectroscopy</a>. The resulting powder is sometimes called a mull. </p>