Photochromic Glass

Japanese: フォトクロミックガラス
Photochromic Glass
Glass that changes color depending on the brightness of light. It is made by precipitating colloidal crystals of silver halide into alkali borosilicate glass. The crystals are microscopic, measuring several tens of angstroms, and exist about 500 angstroms apart. Light and heat cause the silver halide to dissociate and bond reversibly, causing it to become colored when exposed to light and to return to colorless when the light exposure is stopped. Used in sunglasses, etc.
→ Related topics Intelligent materials | New glass

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:
光の明るさにより色の変化するガラス。アルカリホウケイ酸ガラスにハロゲン化銀のコロイド状結晶を析出させて作る。結晶は数十オングストロームの微細結晶で,500オングストロームくらい離れて存在する。光や熱によってハロゲン化銀の解離・結合が可逆的に起こり,光が当たると着色し,光の照射をやめると無色に戻る。サングラスなどに実用。
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