What is devitrification geology?
devitrification, process by which glassy substances change their structure into that of crystalline solids. Glass is formed by the cooling of a rock magma too rapidly for this structural regularity to become established.
What causes devitrification?
Devitrification can occur when heating your glass for too long at a high temperature. The glass looses its glossy appeal and becomes dull or crinkled on the surface. Some people call this whitish scum, crazing. This is really the glass molecules changing their structure to crystalline solids.
How do you remove devitrification from fused glass?
If your glass is flat, you can sift a very thin layer of Clear powder (about 2 grains thick) over the entire piece and fire it to 1425°F (774°C) – 1450°F (788°C) for about ten minutes, depending on your kiln. This should remove the visible presence of devitrification.
What is Devit?
Devitrification (“devit”) is the growth of crystalline structures within or on the surface of glass. Devit can result from firing too slowly through the devitrification range of temperatures. It can also result from firing contaminants like oils and fingerprints onto glass and thus seeding the growth of crystals.
What is Devitrification in fused glass?
Devitrification occurs in glass art during the firing process of fused glass whereby the surface of the glass develops a whitish scum, crazing, or wrinkles instead of a smooth glossy shine, as the molecules in the glass change their structure into that of crystalline solids.
Why is obsidian so dark?
Obsidian is commonly a translucent dark brown or black. Unlike basalt, obsidian’s dark color is due to high amounts of impurities rather than the presence of dark colored minerals. The color of obsidian depends on the chemical composition of the impurities.
Is obsidian sharper than diamond?
Surprising Things about Obsidian Surprisingly, the edge of a piece of obsidian is superior to that of a surgeon’s steel scalpel. It is 3 times sharper than diamond and between 500-1000 times sharper than a razor or a surgeon’s steel blade resulting in easier incisions and fewer microscopic ragged tissue cuts.
What is Devit in glass fusing?
Devitrification in glass art Devitrification occurs in glass art during the firing process of fused glass whereby the surface of the glass develops a whitish scum, crazing, or wrinkles instead of a smooth glossy shine, as the molecules in the glass change their structure into that of crystalline solids.
What Devit 3?
Drug: Devit-3 Oral Drop. Phase 4. Detailed Description: Vitamin D is a fat-soluble vitamin that is either taken by dietary sources or synthesized upon exposure to sun light. Although major function is on bone metabolism, in recent years other effects of Vitamin D attracted attention.