Abstract
AbstractIron compounds were introduced into engobes of varying clay, silica, and feldspar content by (1) direct additions of commercial iron oxide, (2) adsorption from ferric hydroxide sols, (3) use of stains composed of calcined mixtures of ferric and aluminum hydroxides, (4) addition of silica gel in which ferric hydroxide was precipitated, and (5) precipitation with ammonia as the hydroxide from ferric chloride. Methods (4) and (5) were the most satisfactory. Buff colors were obtained with engobes of high clay, browns with high silica, and reds with high feldspar contents. A general study was made of the coloring of ceramic materials by iron oxide, and it was found that the particle size of these materials as well as that of the ferric oxide was of primary importance. An investigation of the effect of gases on the iron oxide present in engobes gave results that are in agreement with the work done on the oxides of iron at the Geophysical Laboratory of the Carnegie Institution of Washington.
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