What are the storage methods for finished jasmine tea?
The factors affecting quality changes in jasmine tea during storage are mainly temperature, moisture content, oxygen and light. Under general conditions, the most influential is the moisture content of the tea. Next are temperature and oxygen, while light is relatively easy to control. Generally, the moisture content of finished tea when it leaves the factory is best kept below 5%, so that quality changes more slowly. The moisture content of finished jasmine tea when it leaves the factory is mostly close to 8%. Therefore, it is more sensitive to humidity, and the relative humidity of the surrounding environment directly affects the rate at which the tea absorbs moisture. So loose-leaf jasmine tea is best stored in a low-temperature, dry warehouse. The relatively ideal conditions are a temperature below 5 degrees and a relative humidity of around 50%. However, in actual practice, consideration must also be given to economic results, and a slightly higher temperature may be adopted.
Oxygen can promote the deterioration of jasmine tea. Therefore, whether the packaging is large or small, it must be packed tightly and firmly to minimise the empty space in the container and reduce contact between the tea and oxygen. In order to better protect the quality of the finished product, where conditions permit, sealed packaging with air extraction and nitrogen filling should be considered.
During storage of loose-leaf tea, attention must also be paid to the timely handling of leftover tea at the bottom of a partially filled case. This is because there is a large empty space in the case of leftover tea and much oxygen, which has an extremely great effect on the colour and taste of the tea infusion. It also easily causes peroxidation of the lipids in the tea, making it stale or even deteriorated.
The storage of jasmine tea in retail stores must be given greater attention because the packaging has sometimes already been opened. Generally, cases should not be opened casually. If necessary, they should be sealed again immediately after opening, to prevent the loss of aroma and the tea absorbing moisture.