Is the cup in the kiln poisonous?

Kiln transformation is a special glaze effect of ceramic products, which is usually formed by oxidation-reduction reaction of iron in glaze at high temperature. Therefore, kiln reform is not a chemical additive and will not produce toxicity itself.

However, if harmful substances (such as heavy metals, lead-containing glaze, etc. ) used in the production of ceramic products, or its surface has scratches and cracks, which may cause harm to human health. Especially ceramic products with lead glaze, long-term use may cause harm to the nervous system and kidneys.