Lexicon: O
Oxidation
To ensure that green tea does not lose its freshness and active ingredients soon after opening, you should remove the air from the top of the packet for storage and keep the bag tightly closed with a clip in the fridge or freezer. Once opened, packs should ideally be used within four weeks.
To prevent premature ageing due to oxidation, KEIKO teas are packaged in a nitrogen atmosphere and stored in a cool place. Transport from Japan takes place in temperature-controlled containers to prevent excessive heating due to exposure to sunlight en route.