Tin boxes for tea packaging are carefully treated to ensure safe tea storage. The inner surface is usually coated with food grade lacquer. This coating creates a strong barrier between tin and tea. It prevents any chemical reaction that could spoil delicate flavors. The lacquer layer also blocks unwanted moisture from entering inside. Sometimes food safe epoxy resins are applied for better durability. These protective treatments maintain the natural aroma of tea leaves. They also stop metallic taste from mixing with fresh tea. The smooth inner lining makes cleaning and reuses much easier. Overall, these coatings keep tea pure safe and fresh.
