It is a visual discrimination. Look at with and without logo, usually crystal products logo on 24%, namely composition of lead oxide; To see if in the strong light reflecting colorful light, crystal has the property of colorless, transparent and refractive index, this is a regular glass products do not.
2 it is to touch. When if visual cannot confirm, but picked up the products phase modulation component, due to the crystal containing lead oxide, so its weight is heavy glass; As it is, available nail clamping side to a pull, like hear ringing dangdang echo, just to prove that for crystal products.
