Foreign porcelain bowls are enamel bowls. The enamel bowl is made by evenly sintering a layer of enamel on the iron bowl blank. In addition to adding beautiful colors, the key is that the enamel layer is wear-resistant and can better resist acid and alkali corrosion, so it is widely used. However, the disadvantage is that the enamel layer is brittle and easy to crack or even fall off under the action of external force. Once cracks or falls off, the protection of internal metal parts will be affected, and corrosion will easily occur and spread at cracks and falls off, which is difficult to repair.

Enamel products commonly known as "foreign porcelain" are often used in daily life, among which pots and pans are the most contacted. However, the US Food and Drug Administration (FDA) recently issued a warning, claiming that lead in diet can come from enamel utensils, and drinking acidic drinks such as coffee and orange juice in enamel cups may lead to lead poisoning and endanger human health.