Abstract
IN NATURE of November 12, 1896, there appeared a letter asking for some explanation of certain purple patches frequently noticed by the writer (A. Pedder) on roadways and pavements, especially at Bath. There were but three replies, two of which suggested “copying-ink” pencils as responsible.
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SOUTHERDEN, F. “Purple Patches”. Nature 58, 521 (1898). https://doi.org/10.1038/058521e0
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DOI: https://doi.org/10.1038/058521e0
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