Resistance to stains

Method applicable to all working surfaces of ceramic tiles to determine their resistance to stains.
Each staining agent must remain on at least 5 testing samples, for at least 24 hours, whose working surface has been cleaned and dried beforehand. Removal of the staining agents takes place in subsequent steps using various cleaning agents and cleaning procedures:

CLASS 5: the stain is removed using hot water;
CLASS 4: the stain is removed using a weak commercial cleaning agent;
CLASS 3: the stain is removed using a strong commercial cleaning agent;
CLASS 2: the stain is removed using solvents, such as acetone for example.

All Marca Corona products satisfy CLASS 5.