Porcelain, as a practical, beautiful, economic, easy to clean supplies, has always been inseparable from people's daily lives, ceramic tableware is essential in every household kitchen. People have the most chance of using ceramic tableware, but did you ever think that it would also cause food contamination?
The main hazards of ceramic containers come from the ceramic glazes, enamels, and color glazes that are applied to the blanks during the manufacturing process. The hazards of enamel containers are also the metal substances in the enamel. ?
In a European country in the 19th century, some people had a strange illness. Patients often had symptoms such as abdominal cramps, neuralgia, anemia, mental retardation, and decreased ability to identify, weakened children's resistance, and even died. Medical workers later discovered that it was caused by lead poisoning. To further investigate the way lead enters the human body, it is people who are accustomed to using pottery yoghurt that has lead glaze on it. During the storage of yoghurt, the lead in the glaze is dissolved into the yoghurt. People have further studied elements that are harmful to humans in ceramic containers. In addition to lead, cadmium is also observed. ?
When people use unqualified ceramic tableware to hold foods containing organic acids, such as fruits, vegetables, milk, vinegar, and fruit juices, lead and other heavy metals in the glaze will dissolve and enter the human's stomach along with the food. Liver and kidney and other important organs and tissues will lead to lead poisoning when the accumulation reaches a certain level. ?
The half-reduction (decay) periods of lead and cadmium in the human body are 1460 days and 16 to 31 years, respectively. Therefore, the impact on the human body is long-term. Lead and cadmium are also harmful to the growth and development of children. ?
When consumers purchase ceramic tableware, they should pay attention to choose a small decorative area or safe underglaze or glaze tableware. All porcelain that is less glamorous than the picture, smooth in feel and even protruding from the edge of the picture should be purchased carefully. ?
Before using the newly purchased ceramic dishes, cook the dishes for 5 minutes with boiling water or soak in vinegar for 2-3 minutes to dissolve most of the lead. ?
When using, do not use colored ceramic utensils to contain organic foods. ?
The most intuitive and simple way to identify poisonous glazes is:
1 First of all check the appearance, the glazed color painting and the printed chinaware can observe the color floating on the surface of the dense layer of the glaze while observing the light, and the underglaze and the glaze-colored pigment are in the glaze layer. In or under the glaze. ?
2 By touching with the hand, porcelain painted on the glaze has a feeling of not being smooth, while the underglaze and glaze porcelain surfaces are very smooth, and some porcelain glazes with high firing temperatures are also very smooth. ?
If you are not sure when buying porcelain, you may choose pure white, no painted, no printed porcelain tableware.