Abstract
THE laws of metachromism, enunciated by Mr. W. Ackroyd (in his recent paper read before the Chemical Society, NATURE, vol. xiii. p. 298), have an apparent parallel in the order of colours shown by various series of combinations; there being but few exceptions to the following rule, in its application to binary compounds. Increase of the electro-negative element produces a colour change towards the red end of the spectrum, and vice versâ. Thus the sub-oxides are generally blue, and the per-oxides yellow; the sab-sulphides white or yellow; and the per-sulphides red.
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PETRIE, W. Metachromism and Allied Changes. Nature 13, 347–348 (1876). https://doi.org/10.1038/013347c0
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DOI: https://doi.org/10.1038/013347c0
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