THE OXIDATION OF CERAMIC WARES DURING FIRING.—II. THE DECOMPOSITION OF VAFUOUS COMPOUNDS OF IRON WITH SULPHUR UNDER SIMULATED KILN CONDITIONS1

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Abstract
The progress of sulphur evolution is traced from a series of clay bars containing known amounts of various iron‐sulphur compounds, both with and without the addition of carbon, when heated in imitation of a kiln schedule in atmospheres varying from pure oxygen to those commonly encountered in kiln practice, including neutral and reducing atmospheres. The varying degree of incompleteness of sulphur evolution is noted. The residual sulphur is found to be practically insoluble in water or aqua regia, but is rendered soluble by hydrofluoric acid. As a plausible explanation there is advanced the theory of the formation of “ferrous sulpho‐silicate.”

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