40 Pottery firing; Custom molding of ceramic products for others; Alteration and retouching of artwork; Ceramic processing; Treatment of materials, namely, semi-precious stones, articles of stone, metals and glass materials; Treatment of crystalline materials, namely, semi-precious stones, articles of stone, metals and glass materials; Manufacturing services for others in the field of ceramic products; Processing and finishing of glass; Treatment of materials for the manufacture of ceramic goods; Treatment of materials in the nature of glass; Glass blowing; Glass polishing; Manufacture of ceramic products to order and/or specification of others; Custom fabrication and production of ceramic products; Ceramic glazing; Glass tinting; Glass resurfacing; Treatment of materials for the manufacture of ceramic products; Bevelling of glass; Treatment of glass materials