Y., obtained a patent for a
phosphorescent composition, dated August 9, 1881.
The author says: My invention relates to an improvement in
phosphorescent illuminants.
I have taken advantage of the peculiar property which obtains in many
bodies of absorbing light during the day and emitting it during the
night time.
The object of my invention is the preparation by a prescribed formula,
to be hereinafter given, of a composition embodying one of the
well-known phosphorescent substances above referred to, which will be
applicable to many practical uses.
With this end in view my invention consists in a phosphorescent
composition in which the chief illuminating element is monosulphide of
calcium.
The composition obtained by the formula may be used either in a powdered
condition by dusting it over articles previously coated, in whole or in
part, with an adhesive substance, or it may be intimately mixed with
paints, inks, or varnishes, serving as vehicles for its application, and
in this way be applied to bodies to render them luminous.
The formula for obtaining the composition is as follows: To one hundred
parts of unslaked lime, that obtained from calcined oyster shells
producing the best results, add five parts of carbonate of magnesia and
five parts of ground silex.
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