Do Vinegar and Pomegranate Molasses Ever Go Bad?

Vinegar, pomegranate molasses, and citric acid last far longer than most foods thanks to their high acidity, and they generally don't spoil in the usual sense. That doesn't mean nothing ever changes, though — sediment at the bottom of the bottle, a darker color, or a thin film on the surface can all show up over time.

What changes show up in vinegar?

A cloudy, stringy substance settling at the bottom of apple cider or wine vinegar is what's called the "mother of vinegar" — a natural formation, not spoilage. The vinegar is still perfectly safe, and that substance can even be used to start a new batch. The color may darken a little over time too, which also isn't a problem.

Real spoilage in vinegar only shows up if the cap leaks or another liquid gets into the bottle; that's when you might see mold on the surface, and the bottle should be discarded. For pure vinegar, that's genuinely rare.

What changes for pomegranate molasses and citric acid?

Pomegranate molasses thickens and darkens over time — that's just the sugar and acid naturally concentrating, and the flavor sometimes even sharpens. But a white, fuzzy mold ring at the neck of the bottle, or a sharp alcohol smell on opening, is real spoilage, and that bottle shouldn't be used.

Citric acid is a dry powder, so it practically never spoils; the only risk is picking up moisture and clumping. Clumped citric acid can be crushed and used again without any safety concern.

How should these sour additives be stored?

Vinegar and pomegranate molasses can be kept at room temperature, in a cupboard out of direct sunlight; the fridge isn't required, but a cool spot slows down changes in color and thickness. Sealing the bottle tightly after every use keeps out both insects and airborne moisture.

Citric acid has an almost unlimited shelf life in a sealed jar; the real risk is a lid that doesn't close all the way or a humid kitchen. Dipping a wet spoon into the jar is the most common reason this group of ingredients spoils at all.

What all these sour additives share is high acidity that makes for a poor environment for most bacteria and mold. So sediment, slight darkening, or thickening aren't cause for concern; the real warning signs are visible mold or a sharp, alcohol-like smell.

Giving the bottle a gentle swirl before using it helps tell whether the sediment at the bottom is mother of vinegar or something else entirely; mother of vinegar drifts slowly without breaking apart, while a foreign particle looks sharper-edged. When in doubt, replacing the bottle is the safest call.

In short, spoilage is rare in this group of ingredients, and when it happens it's usually down to a storage mistake — a leaking cap or a stray liquid getting into the bottle.