See
http://www.spectrumglass.com/Library...FishStory.html

"According to Scientific American, water causes glass to crack
more easily because when a water molecule enters the crack, a
reaction occurs in which a silicon-oxygen bond at the crack and
an oxygen-hydrogen bond in the water are cleaved, creating two
hydroxyl groups attached to silicon. As a result, the length of
the crack grows by the size of one bond rupture. The water
reaction reduces the energy necessary to break the
silicon-oxygen bonds, thus the crack grows faster."

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Regards
Blue

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