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Updated: May 11, 2025
In all the substances investigated by him in which phosphorescence was introduced he found that three conditions were essential to its production: that oxygen should be present; that there should be an alkaline reaction in the phosphorescing mixture that is, a reaction such as is produced on acids and vegetable coloring matters by potash, soda, and the other alkalies; and that some kind of chemical action should take place.
Therefore it is quite possible that at some extremely high frequency, when behaving practically as a non-conductor, a metal or any other conductor might exhibit the quality of phosphorescence, even though it be entirely incapable of phosphorescing under the impact of a low-frequency discharge. There is, however, another possible way how a conductor might at least appear to phosphoresce.
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