Abstract
IT may interest your readers to know that pure alumina dissolved nearly to saturation before the blowpipe in an acid flux, such as a bead of phosphoric acid, invariably causes that to assume a pale but beautiful sky blue on cooling.
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ROSS, W. Alumina. Nature 18, 279 (1878). https://doi.org/10.1038/018279a0
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DOI: https://doi.org/10.1038/018279a0
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