bof wrote:
In message , Huge
writes
Nickel suphide inclusions.

http://www.glassonweb.com/articles/article/330/

Makes toughened glass shatter spontaneously.

Astonishing really, a single 100um particle changes phase after 10
years and an entire window comes showering down from the 11th floor.
Beats a butterfly beating its wings in China causing storm in
Harrogate.

Even worse is those bleedin' Peking Cabbage Whites with nickel sulphide
inclusions.Play havoc with the stuff in the greenhouse they do, not to
mention the greenhouse itself.