Manufacturer and Builder 10, 1894
According to M. Jacksh, a Moravian chemist, there are four sulphurete which become luminous after exposure to daylight, viz, the sulphurets of calcium, strontium, barium and zinc. The sulphuret of barium gives a faint, yellowish glow and those of barium and zinc a greenish glow, the latter compound being rare and difficult to obtain. Sulphuret of calcium is the substance commonly employed for commercial purposes, as luminous paint, etc. The others possess a phosphorescence which is but feeble and short live d.
— Invention.
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