COLOR-CONTRASTING GLASS Russian patent published in 1994 - IPC

FIELD: glass industry. SUBSTANCE: color-contrasting glass has, wt.-%: silicon oxide (SiO₂) 54.2-62.8; boron oxide (B₂O₃) 17.7-21.5; potassium or sodium oxide (K₂O,Na₂O) 17.7-21.5; neodymium oxide (Nd₂O₃) 0.61-1.81; praseodymium oxide (Pr₂O₃) 0.80-1.27; cobalt oxide (CoO) 0.006-0.018, and manganese oxide (Mn₂O₃) 0.044-0.081. Image degree of contrast τ₄₄₅/τ₄₉₀ is 0.73-0.97. Glass is used for color filter making. EFFECT: enhanced quality of glass. 2 tbl