Can't change curtain wall glass elevation color

[helplessconstable]

Toughened glass can shatter "on its own accord" and without obvious damage through inclusions of nickel sulphide although this is fairly rare. But it can occur where the glass has not been Heat Soaked. Surface damage can also cause the glass to spontaneously break as can poor edge work during the Toughening process and poor glazing. Many years ago a colleague used to score the edge of Toughened glass, set it down next to a new starter and watch it explode at a later time without being touched. Can't do that now because of those meddling H&S people!