Our ceramics are handcrafted in a durable, high-quality porcelain clay body and glazed with certified food safe, lead-free glazes. Every piece is oven, microwave, and dishwasher safe; however, hand-washing will always prolong the life cycle of your pottery. Dirt and stains on unglazed surfaces can be removed with a scrub brush and a bit of baking soda. For stubborn stains, gently sand the surface in a circular motion with a fine-grit sandpaper . Metal marks from silverware (due to the ceramic being harder than the metal) can be easily removed with Bar Keeper’s Friend. Do not expose the wares to sudden, dramatic shifts in temperature (e.g. place into a hot oven from the freezer) or place over an open flame.