Abstract
IF a slip of the prepared paper, used for testing for atmospheric ozone, be carefully moistened on one side with alcohol, using a clean camel-hair brush, on burning off the spirit and immersing the slip of paper in water the paper changes to a deep purple colour, as deep as No. 8 in Negretti and Zambra's scale of colours for ozone.
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P., J. Ozone. Nature 23, 125 (1880). https://doi.org/10.1038/023125d0
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DOI: https://doi.org/10.1038/023125d0
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