i just had my first taste off my first homebrew it was just a k4k everything tastes fine except its got a tinny taste to it just wondering if anyone had any suggestions on what it may be. It was brewed at 20-22 deg it was in the fermenter for 2 weeks and its been in the bottle 4 3 weeks it was a coopers draught with the coopers be2 and kit yeast im just wondering if i may have accidently scraped some off the inside off the tin into my wort and if i have did i ruin it or is it infected?