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.
2. The described process, which consists in placing clean and red-hot
clam shells in a saturated solution of sea salt, and then drying them,
for the purpose specified.
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