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Organic matter (OM) is an impurity in mineral raw materials used in pharmacy. The European Pharmacopoeia test of “organic impurities”, based on the visual colour change in a sample after calcination, regulates the suitability of kaolin for use. We performed this test on 21 kaolins having OM contents between 0.01% and 0.41%, using both visual estimations and instrumental measurements of colour: visual...
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