If you have actually ever found a bottle of red wine that's been being in your kitchen area for a couple of months (or years) and taken a smell, you know that wine can spoil. While white wine doesn't technically ruin the way other food does, direct exposure to oxygen, heat, and sunshine can cause it to break down, offering it an unpleasant taste.
https://cleardex.io/?p=808 How does wine ruin? Gradually, the substances in white wine that provide it its signature taste and scent break down, and the white wine starts to taste vinegar-y and flat. This process is accelerated by heat and light, so it is essential to keep white wine in a cool, dark location.
Surprisingly, wine really improves with age, up to a point. As red wine ages, the tannins (substances that give it a bitter taste) begin to break down and the wine becomes smoother and more complex. This is why numerous red white wines enhance with age and why most white red wines are best consumed young.
However, once a white wine begins to ruin, there's no going back. As soon as those tannins have broken down, they're opted for great. If you come across an old bottle of white wine that's starting to turn, it's finest to just pour it down the drain.