I had a metallic taste on a brew once - totally undrinkable. TWANG at the very end of the taste event. It was like sucking on aluminum foil. I looked and looked for a reason and no one here had a valid answer.
I let it sit for 2 months and wrote it off. A friend of mine took a few home and called me up saying "What was the problem?"
I ran downstairs and put a few in the refrig. Next day i tried one . . . . it was gone!!!
My recipe had Maple syrup and I'm thinking the extra sugar??? might have caused it.
Yes - I can STILL taste it way in the background but only because "I" know it was there. No one else notices it.
Grinders Island Brewery - Pipeline
Bottled! Award winning East India Porter, Oatmeal Stout, Milk Stout, Saison fermenting at a nice controlled 85 degrees (up from 70) as it should be - weird isn't it.