The indication of acid resistance has to be considered from a health point of view (according to current law in regard to lead and cadmium solubility) as well as from an optical point of view of the fired ceramic (attack of the glaze surface due to acidic foods).
"Yes" means that we cannot detect any optical attack under our test conditions, while "No" means that under our test conditions an optical attack of the glaze surface can be determined. In both cases, however, no raw materials containing lead or cadmium were used in our formulations (neither with nor without labelling)!
In the case of "Contains cadmium inclusion pigment" it is assumed that the legal limit values for cadmium solubility can be complied with under normal production conditions.
Due to the legal regulations, we do not make a statement regarding the suitability for dinnerware with marking "Contains cadmium frit" or "Contains lead frit".