When
cold, and after exposure to light, this mixture will become luminous.
Instead of these two ignitions, the same object may be in a measure
accomplished by the addition of the full amount of sulphur with the
phosphide and sulphide of calcium and raising it to a white heat but
once. The calcium phosphide is prepared by igniting phosphorus in
connection with newly slaked lime made chemically pure by calcination.
The condition of the shells when the sulphur is added is not material;
but the heat renders them porous and without moisture, so that they will
absorb the salt to as great an extent as possible. Where calcined shells
are mixed with solid salt, the absorbing power of the shells is greatly
diminished by the necessary exposure, and there will be a lack of
uniformity in the saturation. On the contrary, by plunging the red-hot
shells in the saline solution the greatest uniformity is attained.
Instead of using clam shells as the base of my improved composition, I
may use other forms of sea shells--such as oyster shells, etc.
I claim as new:
1. The herein described process of manufacturing phosphorescent
materials, which consists in heating sea shells red-hot, treating them
while heated with a bath of brine, then, after removal from the bath,
mixing sulphur and phosphide and sulphide of calcium therewith, and
finally subjecting the mixture to a white heat, substantially as and for
the purpose described.
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