This weekend I brewed a batch. The mash went well and tasted sweet and loveley. I boiled and chilled and racked to my carboy and sipped a taste from my hydrometer flask and it had a horrible acidic/chemically/bitter taste. I am assuming that the taste did not come from my mash or anything preceding it. I boiled in an aluminum turkey fryer pot that I have repurposed as a brew pot a few batches ago, I have used it for beer before with no ill effects. I chilled with a copper immersion chiller that I have used before. I was wondering if anyone may have any idea of where it may have come from and wether it may go away eventually. Does copper ever impart any bad flavors? is it possible that I scratched the pot with my chiller? it doesn't look lilke it but does this ever happen?