Abstract
BASIC dyestufs are adsorbed on clay minerals by cation exchange reaction. The amount of dye adsorbed1 and the resulting colour transformations2 provide a possible basis for identifying clay minerals, but they are not very reliable. We have found that clay mineral–dye complexes exhibit characteristic thermograms and this method may possibly be applicable to the identification of clay mineral. Certain clay minerals which exhibit similar thermograms can be differentiated by the thermograms of their dye complexes.
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RAMACHANDRAN, V., KACKER, K. & PATWARDHAN, N. Basic Dyestuffs in Clay Mineralogy. Nature 191, 696 (1961). https://doi.org/10.1038/191696a0
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DOI: https://doi.org/10.1038/191696a0
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