Rod Miller wrote:Ok if it is not oxidization then could it be something more akin to unnatural mix of acid types tartaric versus citric or malic? Or an unnatural concentration of tartaric acid. It is true that it easy to taste tartaric if it is added after primary fermentation.
I doubt you'd be able to detect acid ratio changes but you never know, I suppose. Tartaric and malic comprise the vast majority of acid in grape juice, in that area with tartaric dominating, then malic and very small amounts of citric. Winemakers choose tartaric for acid adjustments first of all precisely because it is far and away the most common wine acid. They typically don't add malic to whites because it adds a distinct apple-y flavor or to reds because that would just add to the malic that needed to get converted to lactic in malolactic fermentation (MLF) - and to lactic acid concentrations in the final wine. Citric acid as a rule doesn't get added to grape wines because there's very little in grapes in the first place and because ML bacteria can convert citric to acetic.
Virtually all red wines do go through MLF, so the acids you taste in red wine are almost invariably tartaric first and lactic second. The ratios are variable depending on grape, harvest, terroir and so forth, but tartaric is always dominant. It could be you're highly sensitive to the ratio but with all the natural variation in that ratio, it seems unlikely to me that anybody could tell a unnatural variation in the ratio from a natural one.
As for tasting tartaric added after fermentation - maybe. Not because you can taste the difference between "natural" and "artificial" tartaric acid - they're still the same chemical, no matter when they're added - but because *any* adjustment made that late naturally risks a certain disjointedness in the wine. But winemakers know that and for that reason, you'll probably never encounter a wine treated that way. I knew better than that even making my very first homemade wine