Thanks for your input Michael.
Strange isn´t it. A few weeks ago I discovered a long forgotten stash of mainland Oolongs in my cellar. They´ve been kept airtight in aluminum-foil bags but didn´t survive it. 3 years and they´re dead. One TGY from the WuYi area [chinese marketing gag ?] I kept in a box upstairs for around 2 years tastes as good as "fresh". I´d really like to know if there are any special processing techniques behind this ?!?! Time to get back to China, sniff ...
Karsten [just gongfuing some of that TGY, shhllrp ...]