1. Select qualified suppliers.2. Suppliers provide certification documents or inspection reports, and QC confirms the validity of the certification documents.(1) Both the material test and the dissolution test must comply with the "Sanitary Standards for Food Appliance Container Packaging" announced by the Ministry of Health and Welfare.(2) The colorant must comply with the "Scope of Use and Limits of Food Additives and Specifications" announced by the Ministry of Health and Welfare.