The early spring green lea is the best in quality. It has a bnght green color, strong and lasting fragrance, green, bright and clear liquid and a refreshing taste.
Storage is critical for green tea quality. Its deterioration leads to its color to change from green and bright to withered yellow, the liquid turns darkish yellow, losing fragrance and taste becoming bland. Absorption of foreign odors may greatly affect the quality. Therefore, it is important to learn how to store it.
Factors contributing to deterioration of green tea
Temperature is a major factor causing deterioration. Higher the temperature, faster will be the oxidization of the tea polyphenol, and consequently, quicker the deterioration.
Elements such as tea polyphenol in a tea leaf may be oxidized in conditions having around 20% oxygen in the air. Generally, the degree of deterioration is directly proportionally to the duration of its contact with the air.
Tea is a hydrophilic substance; therefore the moisture content in a tea leaf will also increase when stored in a place with high moisture. Many elements contained in a tea leaf are hydrophilic compounds which may cause molding and accelerate deterioration.
Due to photosynthesis, pigments and esters contained in a tea leaf may produce some foreign odors.
Toa has a porous texture liable to absorb odors and consequently, cause deterioration it the toa is stored in an environment having vaned unpleasant odors.
Storage at low temperature
Green tea can be stored in a refrigerator (1) Pack the tea in small packs; (2) Seal the tea packs and store in temperatures of 3-6’C (Note: The tea should be sealed and preferably stored separately to avoid absorption of foreign odors II possible, koop in a refrigerator especially for tea storage.) Take out the tea leaves lor drinking Keep outside till the temperature of tea equals room temperature
Storage in sealed packs at normal temperature
The green tea can be put in sealed packs and stored in a coo1 dry place at normal temperature. The tea packs must be sealed, alight and away from light, moisture and foreign odors
Storage after deoxidation
Green tea cannot be vacuum-packed because it may break the dried tea. and consequently, affect the appearance which is critical to the quality. However, deoxidizer placement and nitrogen-filling ways of deoxidation can be adopted for green tea storage.
Storage with dry lime
Pack the tea In air-permeable papers. Keep dried lime in a doth bag and place at the center inside the pottery jar. Put the tea around the bag. and finally place the jar in a cool and dry place. Check the lime regularly and replace when it is found to be moisturized. This is the traditional way to store Long Jing tea
The principle of green tea storage is ‘low temperature and moisture and avoidance of light, oxygen and foreign odors* However, the tea bought home must contain 6% moisture, otherwise it detenorates In caso of large quantities, it must be packed in small units for the convenience of drinking or storage Furthermore it is recommended that the same package be used for the same variety and quality tea otherwise the quality may be affected.