Causes of devitrification, commonly referred to as " devit ", can include holding a high temperature for too long, which causes the nucleation of crystals.
12.
Moje was looking for a glass manufacturer that could make a wide palette of coloured glass but also help with the incompatibility and devitrification problems that he was experiencing.
13.
The term " devitrification " is used by archaeologists and art historians to refer to a glass object which has lost it vitreous nature, giving the glass a weathered appearance.
14.
Techniques for avoiding devitrification include cleaning the glass surfaces of dust or unwanted residue, and allowing rapid cooling once the piece reaches the desired temperature, until the temperature approaches the annealing temperature.
15.
In the ancient rocks of Wales, Charnwood, the Pentland Hills, etc ., similar tuffs are known, but in all cases they are greatly changed by silicification ( which has filled them with opal, chalcedony and quartz ) and by devitrification.
16.
The chemical compositions of some types of glass can make them more vulnerable to devitrification than others, for example a high opaque glass can devit easily as crystals are present in the glass to give its opaque appearance and thus the higher the chance it might devit.
17.
Devit spray can be purchased to apply to the surfaces of the glass pieces prior to firing which is supposed to help prevent devitrification, however there is disagreement over the long term effectiveness of this solution and whether it should be used as a substitute for proper firing techniques.
18.
Since devitrification can change the COE somewhat, and devitrified glass tends to be somewhat harder to melt again, there is the possibility of this technique resulting in a less stable piece, however it has also been used effectively with full-fused pieces with no apparent problems.
