1. Do not display ceramic plates on metal prongs. Many people make this mistake when displaying ceramics. Over time, this can damage the surface of your ceramic piece, even chipping or cracking it.
2. Do not immerse porous ceramics (like earthenware) for long periods of time. They can be washed gently (*see the ceramic washing method below), but not left to soak. They absorb water like sponges, and this can cause many different problems (cracking, water stains deep in the piece, etc.).
*** Strong items can be washed gently and very quickly (if absolutely necessary) with lukewarm water with a bit of gentle dish soap and a soft rag. Air dry. If you have any doubt about the structure of your object, do not immerse it in water. Just wipe gently with a damp cloth. Never put artwork in a dishwasher.