Aluminium bags are widely used to protect the freshness of tea.
Normally, there are two types of aluminium bags available based on quality. One is pure aluminium bag, which means its compenent is 100% aluminium and its transparency is extremely low and protect the teas from all lights. Another is aluminium-coated bag, which refers to its not 100% aluminium, so its transparency is not as good as the pure aluminium bag.
