First of all, you should understand that coloured glaze is glass. It was called coloured glaze in ancient times, but now it is called glass coloured glaze. Now it's just a business name. Glass and crystal are two different things, crystal is crystal, glass is amorphous, glass is artificial, and the main raw material is timely, so glass is artificial, so there is no natural saying. Now there is a glass workshop in Taiwan Province Province. They use lead glass, which is the raw material of glass. Lead glass has a high refractive index, so it looks bright. Some people pretend to be crystals or diamonds, but lead glass is still glass, which means colored glass is still glass, not crystal!

Here I want to correct the act of decorating the sea for love. Crystal is crystal. There is no lead crystal, you are talking about lead glass! Everyone likes crystals and diamonds very much, but many people have entered a misunderstanding on these things! Professionally speaking, among crystals, only amethyst has an independent name, and crystals of other colors are called professional name crystals. If you want to say its color, you can say yellow crystal and brown crystal. In addition, there is another kind of crystal called hair crystal, which actually means that there are hair-like inclusions in the crystal.

There are artificial crystals, and now the price of artificial crystals is not much different from that of natural ones, but artificial crystals are not glass, and there are essential differences between crystals and glass! We call glass supercooled liquid professionally. If you say that glass is solid, it is actually wrong. Glass exists in a glassy state other than the three natural states. If you enlarge glass at a high magnification, its structure is the same as that of water.

Swarovski crystal is actually lead glass. It is called lead glass because lead oxide is added to the raw materials when the glass melts. Lead oxide can increase the refractive index of glass and make it look particularly bright. The lead glass can even imitate diamonds. Lead glass is toxic when burned, because the melting of glass is above 1000 degrees Celsius and that of soda-lime-silica glass is above 1600. At high temperature, lead oxide will volatilize. There is a teacher in our department who specializes in the research and development of lead glass. He lost all his teeth at a very young age and suffered from serious lead poisoning. But after firing and cooling, it is non-toxic and can be used! No problem!

I want to say more about diamonds here. Maybe you already know, but you can let your friends who don't know know about it:

We have always heard that there are Austrian diamonds, Soviet diamonds, Czech diamonds and rhinestones on the market. Those are not diamonds, diamonds are diamonds, and nothing will be added in front to determine what diamonds she is, no!

Austrian diamonds are actually glass, Soviet diamonds are cubic zirconia, and diamonds are plastic. ...

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The correct way to disappear: Swarovski crystal is lead glass, and she is indeed an imitation crystal, but I want to make it clear that Swarovski's "crystal" is different from crystal, but it is no different from glass! She's glass!

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The landlord mentioned the glaze color, which explained a lot. You can go to the bookstore to find a book on ceramic technology, which has a detailed description of the performance of glaze. Let me briefly talk about it here.

Many people think that glaze color is poisonous, but it is not the poison of glaze, but the poison of glaze color. Lead oxide can also be added to glaze, but the firing system temperature is very high, above 1000 degrees. Lead oxide volatilizes during firing, so there is no problem. On the other hand, the glaze color is that the fired pottery decals are painted on the upper surface of the glaze. When burned at low temperature, decals are also pigments, which may contain lead, and because the temperature of secondary firing is very low, there may be lead residue.

There is a difference between glaze color and colored glass! Can't say glaze is colored glass!

It may help you understand that some glazes are fired directly from raw materials. The raw materials here are mineral raw materials. The raw materials are evenly mixed according to the formula, ground, glazed and dried. There are other glazes, and frits are added to her raw materials. The frit here is glass. If the frit is colored, it is what you call colored glass. But generally, frit, that is, colored glass, is not used as glaze alone, because there are many factors to be considered in glaze making. The most important thing is the combination of glaze and blank, which depends on whether the glaze and blank can be well combined and whether the thermal expansion coefficient is close. If it is not tight, there will be defects such as glaze shrinkage or peeling. Whether the volatilization of green body and the firing temperature of green body glaze are similar, we can't put the glaze fired at 1200 degrees on the green body fired at 1000 degrees, and vice versa. Therefore, it is necessary to add some other mineral raw materials to the glaze for adjustment.

Glaze is different from glass!

I hope it helps you.

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Besides, I want to explain the same thing. When I say lead glass is nontoxic, I don't mean it doesn't contain lead after firing. Lead glass contains lead, but it is stable. We only wear her, not eat her, so she is non-toxic and safe!

Lead glass is radiation-proof, because radiation can't pass through lead glass, but it doesn't mean that radiation won't hurt you if you wear a piece of lead glass, unless you make a tube of lead glass and seal yourself in it, hehe.

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To correct Liu Yi's love of decoration, the main differences between crystal and glass are: crystal is crystal, SiO2 crystal; Glass is amorphous, and its microstructure is short-range ordered and long-range disordered. The refractive index of glass can be made high enough to imitate diamonds, but it is still glass and will not become crystal. The main component of glass is silicon dioxide, and many other mineral raw materials are added during the melting process.

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To be exact, my major is inorganic materials, including glass, ceramics, cement, refractories, jewelry and jade ... jewelry is not my major, but I also got the certificate of gem inspector. I feel very depressed about the common misunderstandings about crystal, glass, coloured glaze, glaze and diamond in China. I answered more than n in the answer, but I found that there are still more than n people who can't tell, alas, helpless.