I had a glass of a nice full bodied red wine tonight. Finished it, and then got a bottle of Kinsale ipa (rocket ship). Out of laziness I used the same glass, but didn't rinse. (was watching a movie and had drained the glass pretty well!)
But got a taste that I would describe as metallic. Kinda coated my mouth. (I find that particular ipa to be a pleasant, almost sweet taste usually). I finished the glass, thinking the metallic taste odd, but the second glass was similar. Unpleasant. So I got a new glass and it tasted as I expected. Was surprised that the taste was so affected by what must have been the residue of the wine, even after a second fill. Just goes to show the importance or a freah/clean glass