The ink in the edding 4200 porcelain brush pen is water-based.

However, as we don’t use food colouring, it doesn’t meet the requirements for items intended to come into contact with food. That's why you should avoid decorating areas of the porcelain that are used for cutting, eating or drinking. For example, only the rim of a plate or the outside of a mug should be decorated and the area just below the rim of your cups should be left clear.