A study of the refractive indices of vitrinites (or predominant constituents) of coals carbonized under pressure (up to 6,000 atmospheres), at different temperatures (325 degrees C and 350 degrees C), and for various lengths of time (up to 25 days) has been made. The results have been correlated with a number of physical and chemical parameters, and compared with those obtained for normal coals; also for coals carbonized at normal atmospheric pressure.

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