I put a bag of '06 loose shu cha into a yixing pot. These bags are used to pack 7 tea cakes. These tea bags are sold in shops in China. The cloth material seems to be made from cotton.
I neglected to check what's inside the pots after moving back from China. After almost 18 months, the teas that's inside the bag that was put inside the yixing pots have turned out to smell of chinese cotton tea bags. And brew just like what it smelled like - yikes! Bad experience.
Another lesson learned - never assume tea bags meant for storing tea cakes are good for storing loose teas.
Would sunning the teas for a week or so bring it back close to it's original flavors?