why some of the glass objects recovered from ancient monuments look milky instead of being transparent?
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Glass is made up of silica. It is partially crystalline and partially amorphous. As time passes due to changes in temperature of the system, it becomes crystalline as some of the atoms become more arranged. It absorbs water and form a layer which results into cloudiness in the galss. Thus the glass turn slightly milky on aging instead of being transparent.
Glass is made up of silica. It is partially crystalline and partially amorphous. As time passes due to changes in temperature of the system, it becomes crystalline as some of the atoms become more arranged. It absorbs water and form a layer which results into cloudiness in the galss. Thus the glass turn slightly milky on aging instead of being transparent.
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Hey !!
When amorphous solid (glass) are heated and cooled slowly, they acquire crystallinity at same temperature. Glass objects of ancient monuments, over a period of years, are exposed to sunlight and cooled during night times, which has resulted in the crystallization of the glass object which imparts milky colour to the ancient monuments.
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