FIELD: glass making. SUBSTANCE: glass is composed of, wt %: silicon dioxide 50-50, potassium carbonate 0-13, caustic soda 0-9, lithium oxide 0-4, calcium oxide 0-3, magnesium oxide 0-4, boric acid anhydride 0-2, zinc oxide 16-30, barium oxide 0-13, titanium oxide 0-6, zirconium oxide 0-5, yttrium oxide 0-5, aluminum oxide 0-3, tin oxide 0-5, lanthanum oxide 0-9, niobium oxide 0-9, bismuth oxide 0-12, germanium oxide 0-5. EFFECT: achieved lead crystal characteristics with no lead added. 14 cl, 7 tbl
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