This product is unique. The result of a special glaze applied by hand that gives each piece its own charm. Due to the matt surface, silvery lines and signs of wear can appear in daily use. This is a completely natural process as the soft metal of the cutlery rubs against the hard, rough glaze. If metal abrasion is visible, remove it with a kitchen sponge and baking soda powder or with cleaning agents for stainless steel, ceramic hobs or porcelain.