Abstract
To those who wish to repeat the experiments on the filtering power of sand, mentioned by Prof. Trouton at the recent meeting of the British Association, I would strongly recommend a solution of the aniline colour known as “Nachtblau.” A strongly coloured solution of this substance passed through Fontainebleau sand issues from it absolutely colourless for a much longer time than does that of potassic permanganate.
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WATSON, C. Filtering Power of Sand. Nature 94, 172 (1914). https://doi.org/10.1038/094172b0
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DOI: https://doi.org/10.1038/094172b0
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