Alex has posted about faulty tea trays (1 and 2), but what about tea trays that just suffer neglect? Feast your eyes on the (hopefully) most disgusting photos to grace the front page of Tea Nerd:
And one wipe later...
If you have a sensitive stomach, it's far too late. Sorry. Anyway, the take home message: clean your tea trays regularly. Also, this is a great example of science (oxidation) in action. You might think I've been drinking shupu lately, but you would be wrong. For the most part, I have only had sencha and green oolongs. Yeah. Please, clean your trays.
[Oh, also, this is not the really cool thing I was planning. That's still in the works...]