| 摘要 |
<p>The glass is made by fusion at 1300-1450 deg.C of a compsn. with concn. of photochromic elements maintained between limits of CuO 0.005-0.011%, Ag 0.175-0.225%, Cl 0.12-0.225%, and Br 0.1-0.15%. The castings are cooled, shaped and re-heated at 550-675 deg.C to develop silver halide crystals, and cooled to ambient temp.</p> |
