Where do lead and cadmium risks in ceramic tableware come from?

Please verify the following points and require itemized written supplier responses:（ceramic tableware lead cadmium risks） Lead and cadmium risks mainly come from glazes, colored pigments, gold decoration and firing control. Low-temperature decals, insufficient curing and contact with hot or acidic foods require attention. Require food-contact declarations and migration reports; avoid odorous, sticky, faded or unidentified products. Define capacity, accuracy, materials and operating environment before requesting quotes on a uniform basis. Request specification sheets, test reports, certificates, maintenance manuals and spare-part lists. During acceptance, verify appearance, dimensions, functions, safety protection and packaging, and keep test records. Do not compare unit price alone; include customization, freight, spare parts, after-sales support and downtime risk. Keep written records of inquiries, confirmations, FAT, acceptance and warranty commitments.