Ageing sheng puerh is not that straight forward as I though. I remember when my first order of full cakes arrived and the scent of young shengs filled the room. The cakes were then stored on a shelf and the fragrance started to fade. Within a couple of months I had to stick my nose very close to smell anything. So, I started to search around the sites and found information about the types of storage and the importance of humidity and temperature. Based on what I read the humidity should be in the range between 60-90 % and the temperature from 20 to 30°C depending on the type of storage and quality of leaves. I prefer to not go into detail since my knowledge is quite limited, instead I would like to share the way I store my cakes.
The first thing was a purchase of a simple device which measures the temperature and relative humidity. I found that the humidity in my room is around 50% during the summer and the first 2-3 months of the "central heating on" season. Then, at the end of the winter, the humidity slowly drop to 40-45%. This is simply not enough.
To increase the humidity I used the classical approach of bowls with water in the cupboard. This helped to increase the humidity to 60 % but the temperature was still low, around 18-19%. So, I decided to improve this setup, and here are the ingredients:
- An old unused bookcase
- One of the shelves is slightly modified (see the pictures below)
- 2-3 bigger plastic flower pots, in one of them an aquarium water heater
- One of the shelves is slightly modified (see the pictures below)
- 2-3 bigger plastic flower pots, in one of them an aquarium water heater
Water containers with the heater (25W) adjusted to 25°C on the bottom shelf.
I use tap water which is (unfortunately) heavily chlorinated what prevent the grow of microorganisms in the container. The upper shelf has holes for air circulation.
The majority of cakes is placed on the upper shelf (in paper bags) but it can be also on the bottom one.
The front side is covered with a rug which let the tea "breath".
Half year ago when I started with this setup the humidity was around 70-75%. Now, when the air is quite dry in the room due to the months of heating, the humidity in the cupboard is between 65-70 % and the temperature 21-22°C. I think this may be ok for the cakes. Once per week the container with the heater has to be refilled (with cca 1L of water). The room is now filled with a healthy scent of young shengs, what is encouraging.
Ageing is tricky. If the humidity/temperature is too low the cakes will not age and they become flat. On the other hand too much moisture can cause a disaster called mold, therefore I try to avoid too humid conditions.
How this setup works, will show the time.