How to Identify the Quality of Ceramics:
When it comes to ceramics, understanding the difference between pottery and porcelain is essential. Pottery is typically fired at lower temperatures, which means the clay remains somewhat porous after firing. This results in a higher water absorption rate and weaker mechanical strength, making it more prone to breakage. To improve its durability and appearance, ancient artisans developed glazing techniques. The glaze melts during firing, forming a glassy layer that fills in the pores and creates a smooth, protective surface. While pottery may have some glaze, porcelain is known for its superior quality, especially in terms of the glaze finish.
When selecting porcelain, it's important to examine the glaze carefully. Beyond visual inspection, you can also test it by touch or other methods. A rough glaze with visible imperfections like bubbles or cracks indicates poor quality and could lead to chipping or cracking over time. Many people choose ceramic items for their aesthetic appeal, so it's crucial to understand the types of glazes used. There are two main types: overglaze and underglaze. Overglaze colors are applied on top of a transparent layer and often contain heavy metals like lead, which makes them unsuitable for food contact. Underglaze colors, on the other hand, are painted beneath the glaze, offering better safety. However, even underglaze can sometimes contain harmful substances if not properly fired.
To ensure safety, especially for kitchen use, it's best to choose white porcelain. This minimizes the risk of heavy metal leaching into food. Additionally, avoid leaving colored porcelain in contact with acidic substances like vinegar or citrus juice for extended periods. Before using new ceramic items, you can boil them in a solution of water and vinegar to help remove any residual heavy metals, such as lead, from the surface.
Lastly, when purchasing ceramics, pay attention to certifications and quality inspections conducted by authorities like AQSIQ (the General Administration of Quality Supervision, Inspection and Quarantine). These tests can provide valuable insight into the safety and durability of the products. By being mindful of these factors, you can make more informed choices and enjoy your ceramic wares safely and confidently.
Aluminum, glass, wood, copper, stainless steel, etc;
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