Glass tiles are pieces of glass formed into consistent shapes.
Whereas clay tile is dated as early as 8,000 BC, there were significant barriers to the development of glass tile, including the high temperatures required to glassmaking and the complexities of annealing glass curves.
In recent years, glass tiles have become popular for both field tile and accent tiles. This trend can be attributed to recent technological breakthroughs, as well as the tiles inherent properties; in particular, their potential to impart intense color, reflect radiance, and remain nonporous to water.
Glass tile introduces complexities to the installer. Since glass is more rigid than ceramic or porcelain tile, glass tiles break more readily under the duress of substrate shifts.
Smalti is made by mixing molten glass with for color in a furnace; the result is a cloudy mixture poured into flat slabs that are cooled and broken into individual pieces. The molten mixture can be topped with gold leaf, followed by a thin glass film to protect against . During the Byzantine era, Constantinople became the center of the mosaic craft, and the use of gold leaf glass mosaic reached perhaps its greatest artistic expression in the former seat of the Orthodox patriarch of Constantinople, the Hagia Sophia.
Traditional smalti tiles are still found today in many European churches and ornamental objects; the method is used by some present-day artisans, both in art installation and fine art. In the 1920s, mass production methods were applied to Smalti tile manufacturing, which enabled these tiles to find their way into many middle-class homes. Instead of the old method of rolling the colored glass mixture out, cooling, and cutting, the new method called for molten liquid to be poured and cooled in trays, usually resulting in 3/4 inch chiclet-type pieces.
In the late 1990s, special glass tiles were coated on the back side with a receptive white coating. This has allowed impregnation of heat-transfer dyes by a printing process reproducing high resolution pictures and designs. Custom printed glass tile and glass tile murals exhibit the toughness of glass on the wearing surface with photo-like pictures. These are especially practical in kitchens and showers, where cleanser and moisture resistance are important.
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