How can you judge whether a ceramic tableware manufacturer is reliable?

Please verify the following points and require itemized written supplier responses:（ceramic tableware manufacturer reliability） Reliable manufacturers provide stable samples, clear specifications, food-contact reports, production capacity, packaging solutions, lead times, QC records and after-sales response. Start with a small trial order and evaluate color difference, breakage, stacking, dishwasher results and serving performance rather than choosing only by lowest price. 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.