| Crystals, as we know them in their industrial | | | | must be at least 10 % lead. The result is a heavier, |
| applications were discovered in the 17th century. They | | | | clearer and more lustrous glass-like substance. It can |
| are traditionally hand blown. Crystals are manufactured | | | | be cut to take many shapes and forms -- making it |
| through the same process as that of glass forming; | | | | ideal for many applications, including fashion |
| the only difference is that instead of soda ash, lead | | | | accessories. |
| oxide is used. For glass to be considered crystal, it | | | | |