Toughened or tempered glass is a type of safety glass processed by controlled thermal or chemical treatments to increase its strength compared with normal glass. Tempering puts the outer surfaces into compression and the interior into tension. Such...
Stained Glass has been practiced since the 12th century or even before that. It was a tedious method to color the glass by adding metallic salts during its manufacturing. The palaces and mansions of kings and princes were decorated with stained...
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