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This web page waechtersbachusa.blogspot.com states the following, "What are the characteristics of high-quality porcelain? To determine the quality of porcelain drinkware or mugs, youll want to evaluate these characteristics." We saw that the webpage said " During the firing process, porcelain is fired in the kiln at very high temperatures around 2,650 F." It also said " This makes the finished product harder and denser than finebone china and more suitable for professional or everyday use. Porcelain is strong and chip-resistant. It is also non-porous, even when unglazed, and has a smooth, watertight surface."