Bottles sold empty, pots, jars of glass sold empty, flasks, not of precious metal; glassware, namely, empty bottles, pots, jars and flasks, not of precious metal; glass materials for decorative purposes, namely, enameled glass, opaline glass, colored sheet glass; opaque or translucent enameled glass, lacquered glass, decorative glass produced by silk screen printing, stained glass, printed glass for decorative purposes, un-worked or semi-worked glass, excluding building glass