Lighting glass containing 0.3 to 1.0% by weight of Sb as Sb.sub.2 O.sub.3
and 0.5 to 1.0% by weight of S as SO.sub.3 in a SiO.sub.2 --Al.sub.2
O.sub.3 --R.sup.1 O--R.sup.2.sub.2 O-based glass (where R.sup.1 represents
Ca, Sr, Mg and Ba and R.sup.2 represents Na, K and Li) in which colloids
comprising SbS.sub.2 and/or Sb.sub.2 S.sub.3 are generated in the glass.
Cristal de la iluminaciĆ³n que contiene 0.3 a 1.0% en peso de el sb como Sb.sub.2 O.sub.3 y 0.5 a 1.0% en peso de S como SO.sub.3 en un SiO.sub.2 -- Al.sub.2 O.sub.3 -- R.sup.1 O -- R.sup.2.sub.2 O-baso' el cristal (donde R.sup.1 representa el CA, sr, magnesio y Ba y R.sup.2 representa el Na, K y el li) en el cual los coloides que abarcan SbS.sub.2 y/o Sb.sub.2 S.sub.3 se generan en el cristal.