Are ceramic tableware safe? What is the reason for kiln glaze change?

We all need to use tableware when eating. There are many kinds of tableware on the market now, each with its own characteristics. Next, Bian Xiao will introduce you to ceramic tableware, and tell you the safety of ceramic tableware, and what is the reason why porcelain becomes glazed in the firing process.

First, are ceramic tableware safe?

Not all ceramic tableware is safe. Long-term use of some tableware will cause chronic poisoning of heavy metals, which will cause damage to skin, teeth, eyes, brain, bones and fertility. These harmful substances are mainly heavy metals such as lead and cadmium contained in ceramic tableware. The degree of harm mainly depends on the amount of these heavy metals dissolved in use and absorbed by the human body. In general, it is best to use the following ceramic tableware less or not:

1, tableware has a large area of patterns or painted colors.

2, tableware patterns too much use of red, dark yellow, dark green and other dark colors.

3. The pattern inside the tableware lacks luster and the surface of the pattern is rough.

4. Low-quality and low-priced bone China white porcelain or other low-temperature white porcelain.

If you don't use it for a long time, the porcelain pattern will deposit a layer of black, gray and greasy tableware.

6. In use, the pattern of porcelain will gradually be corroded and the color will become lighter.

Second, what is the reason for the glaze change in the kiln?

1, kiln glaze, as the name implies, is an unexpected glaze effect in the firing process. Because the kiln contains a variety of coloring elements, porcelain may show unexpected glaze effect after oxidation or reduction. Because the kiln glaze appears by accident, its shape is special, and people don't know its principle. It is called kiln glaze change only because of the change of roasting process in kiln. As the saying goes, kiln glaze is unique and unpredictable.

2. Fired porcelain is found to be not the expected shape or glaze color after opening the kiln, so that porcelain handed down from generation to generation sometimes has special circumstances, which can be said to be kiln change. "Chen Ji Shi" said: Porcelain is homogeneous, so it becomes heterogeneous, the same color, so it becomes different color, and the soil and water are in harmony, which is beyond human power. This is called kiln change. In a word, kiln transformation can be roughly divided into deformation, discoloration, deterioration and so on.

The above is an introduction to the safety of ceramic tableware and the reasons for glaze change in kiln. I hope the above content will be helpful to everyone.