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Crystal simply defined

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Now for the non technical definition of crystal

Crystal is produced in two basic types, soft and hard. Soft crystal is known universally as lead crystal. Lead oxide of up to 35% is added to this crystal to soften it, and to allow it to be formed, blown or molded easily. The lead oxide also gives the crystal a beautiful sparkle. It is easy to grind and polish patterns with. Full lead crystal must have at least a 24% lead oxide content to use this name. Lead crystal is most commonly used for bowls vases and molded shapes. It is a very clear product. Hard crystal is used primarily for optical requirements. It is commonly called Optic Crystal but it’s true name is Opthalmic Crystal or Crown Glass. Its hardness and high clarity makes it ideal for producing telescope and camera lenses. In 1996 Optic Crystal (made only in the US and Europe) was first introduced commercially to the award and recognition industry, but with limited success due to the very high cost. Not long after this China started producing less expensive versions of Optic Crystal known today as K9. Today almost all Optic Crystal products are made from K9, however the quality of this crystal varies widely. The higher the cost the better the quality will be. At the lower end of the cost range K9 crystal will have no UV (ultra violet) light resistance and will turn yellow if exposed to any UV light.Glass

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