APOTHECARY GRADE PORCELAIN- Pharmacies traditionally use non-porous porcelain to grind medication - with great reason. Consider these common issues: wood absorbs the taste of the previous grind - yuck! Marble or granite create marble powder- gross! Stone is hard to clean, and you can't use soap to wash it! Stainless Steel can rust! Our perfectly designed, easy to clean porcelain mortar and pestle allows you to grind your spices, nuts, coffee, muddle drinks, human or pet medication, guacamole.