How to distinguish “crystal wine glass” from “glass wine glass”?

There will be some differences in the aroma and taste between the crystal glass and the glass glass. * * The crystal glass is generally used for wine tasting. Do you know how to distinguish “crystal wine glass” from “glass wine glass”?
Crystal cup
Generally speaking, * * crystal has high hardness: Mohs hardness is 7.0, which is difficult to process. So most of the products called crystal cups are actually crystal glass products, which are close to * * crystal products in terms of specific gravity, permeability and clarity. Since it is glass, it must be different from * * crystal. The former is non-crystal, and the latter is crystal. Under the polarimeter, the former will appear full extinction, and the latter will appear the unique ox-eye interferogram.
1、 History of crystal cup
Before the 13th century
The glass products used by people are opaque or translucent. Later, Venetians fused quartzite and sodium-containing plant ash to produce the earliest colorless transparent glass, called Crystallo. Its composition is similar to that of modern common glass – soda-calcium silicate glass, which is the common glass used today.
After the 13th century
The Bohemians used better quartzite and plant ash containing potassium carbonate to produce glass with higher transparency and refractive index, called Crystalex, which is similar to today’s potassium calcium silicate glass. Later, the composition was improved by adding sodium oxide and boron oxide, with a density of 2.444g/cm3 and a refractive index of 1.50002.
1670
Ravenscroft, an Englishman, found that adding lead dioxide into the glass system can reduce the melting point viscosity, lengthen the shape of the material, make it easy to form, and increase the refractive index and dispersion.
1764
Baccarat, France, was founded and began to promote the production of crystal glass containing 24% lead, known as all-lead crystal.
1895
Swarovski was founded and used glass containing up to 32% lead to make various crystal products, such as various imitation gemstones.
1950s
Czech Republic invented lead-free crystals, such as barium zinc crystal, zirconium crystal, etc. In modern times, there are barium crystal, zirconium crystal, zinc crystal, titanium crystal, mixed crystal, etc.
The crystal glass and glass are very similar in appearance, but they are two different substances. The brightness of crystal is different from each angle, and the brightness of glass is the same from each angle; Scratch the glass with crystal. There are scratches on the glass, which can not be wiped away, and the crystal is not damaged; Scratch the crystal with glass. There are slight scratches on the crystal, but they can be removed immediately after wiping, and the glass is damaged at the same time.