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Glassmaking is the art of making decorative products and functional containers by shaping molten glass paste. The main material of the paste is silica glass which is combined with metal oxides in melting state to create colored glass. Metal oxides such as copper oxide manganese cobalt iron etc. are among the most widely used glass coloring materials. The art of glass making is remarkable in that the artist is faced with a molten material and must always shape it with a distance from it.