Abstract
I HAVE frequently observed the phenomenon described in your correspondent's letter published in NATURE of January 14 on treating plates which had been exposed to the action of Röntgen rays, with a solution of alum.
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RONCA, J. Phosphorescence of Photographic Plates. Nature 69, 296 (1904). https://doi.org/10.1038/069296a0
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DOI: https://doi.org/10.1038/069296a0
