Abstract
THE suggestion of Dr. R. M. Caven (p. 306), that the black colour of flint is due to ferrosoferric oxide, is supported by the fact that flints which have been for some time in contact with gaslime (as when a mixture of these materials is used for road-metal) become stained of a deep blue colour, which has been shown by analysis to he due to ferric ferrocyanide. A discussion on this subject appeared in NATURE in 1904 (vol. lxxi., pp. 83, 126, 176).
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ALLEN, F. The Origin of Flint . Nature 99, 345 (1917). https://doi.org/10.1038/099345c0
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DOI: https://doi.org/10.1038/099345c0
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