Immersion of Porcelain Cups
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Question
I bought a set of several small cups that seem to be made of simple porcelain clay and appear to be coated with lacquer or something shiny. Do they need to be immersed? I bought them very cheaply and thought of using them as disposable (for example, for trips).
Answer
Hello
Cups that require immersion should not be used without immersion, even on a one-time basis.
Clay vessels do not require immersion.
However, porcelain vessels are customarily immersed out of doubt, lest they be coated with glaze.
Source
Shulchan Aruch, Yoreh De'ah, Siman 121