Why Your Wine is Turning Sour—and How to Stop It
Your wine isn’t turning bad—it’s being cooked by sunlight. The moment a bottle of wine is exposed to direct UV rays, its delicate balance of flavors unravels. What starts as a vibrant, aromatic sip becomes a punch of sulfur compounds that smell like wet dog, wet cardboard, and cooked cabbage. This isn’t a natural aging process—it’s a chemical assault known as light strike. The culprit? Ultraviolet light interacting with riboflavin and pantothenic acid in the wine, triggering reactions that produce volatile sulfur compounds. These molecules are detectable in trace amounts, meaning even a few hours of sun exposure can ruin…










