What's the difference between Porcelain and Vitreous China?
As per "The Blue Book of Plumbing" by Trenton Potteries Company:
The process in which many vintage bathroom fixtures were made was by melting the clay into a liquid form and pouring it into a mold. It is thoroughly dried and fired at an intense heat, glazed then fired at an intense heat again. In the photo above it shows that the unfired china clay is much smoother and has a clean and lighter completion, as compared to the unfired porcelain clay, which appears to be darker in color and rough in texture. Many vintage fixtures that were made from Vitreous China often have crazing marks in the china, they appear to be like small cracks but they are not. Crazing marks have no affect on the integrity of the fixture, but they do add a gorgeous patina of age and texture. Porcelain was often put on top of cast iron fixtures for example: cast iron bath tub, and some cast iron sinks.
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