Porcelain and stoneware are generally dishwasher safe. Should any film or coating appear, this is usually due to starch deposits which are not always properly removed in the dishwasher. Over time, such deposits can accumulate to form a relatively thin, but extremely resistant layer, which is also encouraged, for example, by heavily soiled dishes, hard tap water or wrong dosage of detergent.
In general terms, deposits on porcelain glazes can only be avoided by an optimal use of water, water softeners, and a cleansing and rinsing agent.

It’s the best to soak your porcelain in a solution of white vinegar, and the original whiteness of your piece will be restored.

As long as it’s not gilded, porcelain and stoneware are microwave and oven safe.

Yes. Porcelain and stoneware are fired at a high temperature, which makes it resistant to cold.

Cutlery abrasion occurs when microscopic particles from the cutlery rub off onto the hard porcelain glaze due to mechanical friction and pressure. Over time, this causes grey to black streaks and visible scratches on the surface after repeated use.
The glaze of genuine porcelain has a hardness of 5 to 7 on the Mohs scale, which means it can scratch materials with a hardness of 1 to 6. This includes chrome steel cutlery, which generally has a hardness of 3 to 4. In summary, this means that porcelain is harder than steel.

A few simple measures can prevent the formation of cutlery marks on porcelain:

• Use sharp, professionally sharpened knifes

• Replace very old or faulty cutlery

• Rinse properly

• If in doubt, rinse by hand

• Briefly wipe damp dishes with a cloth after washing