Ok, looking for both a good description of what these off flavors taste like and what causes them and what to do to correct them, now or in the future.
Some are obvious, wet cardboard, butter, I can picture those flavors.
Estery has been described as fruity, and I think anyone who has brewed any amount of beer will know the flavor, but maybe we can describe it better.
As well, I here of astringency flavors and I am not sure I can distinguish that one.
What other flavors can we get in a less than perfect brew?