Decaf...leaves a lot to be desired (Leaf pun intended...sorry!) It's not quite as bad with an earl grey because of the bergamot, but I've had undrinkable decaf green tea. Black tea has a kind of aftertaste. I don't know how they process it (some coffees use formaldehyde) but it doesn't taste very good. With coffee, I know there's some very good improved processes (husband roasts his own green coffee beans and he says the water decaf method provides a very good decaf). Maybe something similar exists for tea and you have to search for the right ones.
Maria
Sage: (multiple formats; Amazon or Smashwords--$1.00)
Catch an Honest Thief (Kindle only format: $1.99; a cozy mystery)