Customer Service Good customer service is essential when working with suppliers Customer Service Good customer service is essential when working with supplierszinc sulfide zns supplier. Suppliers should be responsive, transparent, and willing to work closely with customers to address any issues or concerns.CSPI’s Chemical Cuisine is the web’s definitive rating of the chemicals used to preserve foods and affect their taste, texture, or appearance. Besides titanium dioxide, the group recommends avoiding artificial sweeteners like aspartame, acesulfame potassium, and sucralose, as well as synthetic food dyes like Yellow 5 and Red 3. CSPI and others have recently asked the Food and Drug Administration to ban the latter dye in foods and ingested drugs because the FDA has already determined that it is a carcinogen unsafe for use in cosmetics.