ADDITION AGENT TO GLASS Russian patent published in 1999 - IPC

FIELD: agriculture, medicine and building industry. SUBSTANCE: addition agent comprises at least two rare-earth metal oxides consisting of , ratios of components being as follows, wt %; Sm₂O₃, 0.5-90; Eu₂O₃, 0.5-80; CeO₂, 0.5-40; Y₂O₃, 0.1-40; Pr₂O₃, 0.1- 4.0; Tb₂O₃, 0.1-1.0; Gd₂O₃, 0.1-10; Nd₂O₃, 0.01-0.5; La₂O₃, 0.1- 10; and Dy₂O₃, 0.1-1.0. Glass includes silicate borate and phosphate glasses. Addition agent includes rare-earth metal oxides, production waste thereof, luminophore waste, and some fractions of rare-earth metal concentrates. EFFECT: transformation of ultraviolet constituents of solar light to orange-red constituent with wavelength of 580-700 nm. 7 cl, 1 tbl