Abstract
SOME years ago there were many blue-stained flints on a road near Cambridge. Lime from gas-works was about to be mixed with the flints used as road-metal, and the two different materials had lain for some time in heaps by the roadside. The blue colour, in some instances very intense, was developed wherever a heap of flints and one of lime touched each other; from which I surmised that the calcium sulphide of the gas-lime had reacted with an aluminium compound present in the flints, producing a substance akin to ultramarine.
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ALLEN, F. Blue-stained Flints. Nature 71, 83 (1904). https://doi.org/10.1038/071083c0
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DOI: https://doi.org/10.1038/071083c0
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