Falke, Jacob (1869). "The Workshop, Vol II, No. 10, p.148". London. …however highly majolica [tin-glazed] may be esteemed, it will always remain an article of luxury and ornament only…
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C Drury E Fortnum, 1875, MAIOLICA Stanniferous Glazed Wares, South Kensington Museum Art Handbook No. 4. "It was found that by the addition of a certain portion of the oxide of tin to the composition of glass and oxide of lead the character of the glaze entirely alters. Instead of being translucent it becomes, on fusion, an opaque and beautifully white enamel... after immersion in the enamel bath, and subsequent drying, the painting is applied upon the absorbent surface; the piece being then subjected to the fire which, at one application, fixes the colours and liquifies the glaze. This "enamelled" pottery (emaillee) is by far the more important group of the glazed wares, being susceptible of decoration by the lustre pigments, as well as by painting in colours of great delicacy; and it comprises the Hispano-moresque, the real Maiolica, and the perfected earthenware of Italy and other countries." http://www.ebooksread.com/authors-eng/c-drury-e-charles-drury-edward-fortnum/maiolica-tro/1-maiolica-tro.shtml
