| 摘要 |
<p>Transparent photochromic glasses containing silver halide crystals sensitized with copper having base compositions within the alkali metal aluminoborosilicate system have at least 0.025% As2O3 and/or Sb2O3 is present in the composition to insure that more than 50% of the copper is present in the Cu<+> state, Where an oxidizing agent is added to the composition, the amount of As2O3 and. or Sb2O3 will be increased to reduce the agent as well as to insure that more than 50% of the copper is present in the Cu<+> state. </p> |
