Explanatory notes
… in the glass industry or for colouring or finishing metal articles. (1) Prepared pigments, prepared opacifiers and … (3) Engobes (slips) are semi-fluid pastes with a basis of clay, whether or not coloured, used to coat ceramic ware, … lustres. (5) Glass frit and all other varieties of glass (including vitrite and glass obtained from fused quartz or …