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"Dry rot" (usually fungal decay of cut and cured wood) does not affect ceramic materials, such as your china.
As a case in point, my parents own a centuries-old Chinese vase dating to the early Ming dynasty. Though it is not a significant million-dollar piece, it is a definitive example of "old china". It is kept in a case, and is never washed. One can assume that conditions have been similar through most of its existence.
First answer by Darkbeanie. Last edit by Darkbeanie. Contributor trust: 31 [recommend contributor]. Question popularity: 10 [recommend question]
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