One of the blog’s most popular posts over its 8-plus year history is about residual sugar. That’s because it uses English instead of winespeak to describe what residual sugar is and what makes a sweet wine sweet. And that residual sugar is the sugar from the grapes that’s left over after fermentation; more residual sugar makes a sweet wine, and the absence of residual sugar makes a dry wine.
Two things are missing from that post: Nifty charts and graphs, mostly because the Wine Curmudgeon is not a charts and graphs guy, and an update that better describes how dry wines can seem sweet thanks to post-modern winemaking techniques, which include adding sugar or something similar (corn syrup, grape juice concentrate) to the almost-finished product. That’s one reason why a dry wine with 14.5 percent alcohol, where there is an absence of residual sugar, can seem sweet.
Plus, I never really explained how residual sugar is measured and the various levels of sweetness, since it confuses me. I have problems with g/L, which is grams per liter, as well as converting it into percentages, which I do understand.
But, thanks to two terrific websites, we not only have charts and graphs, but more insight into adding sugar to already-fermented wine, as well as how to measure residual sugar and what the measurements mean. My thanks to Liquid Party Works, which has one of the former and some of the second (which you can find at the link), and to Frank Schieber at MoundTop MicroVinification, whose chart detailing sweetness levels is perhaps the best I’ve ever seen (even if it’s not all that pretty). That’s the one at the top of this post.
White zinfandel, for example, would be in the 3 percent category, while a dry riesling and some sweet reds, like Apothic, would be in the 1-3 percent category. Doesn’t get much more straightforward than that.