Spice-infused vinegar can generally be reused after a week, but it's crucial to check for any signs of spoilage like cloudiness, mold, or an off odor. If it appears and smells fine, it's safe to reuse.
The acidity of vinegar acts as a natural preservative, inhibiting the growth of many harmful bacteria. When you infuse vinegar with spices, the spices add flavor and aroma, but they also introduce organic matter that could potentially degrade over time. After a week, the vinegar should still be safe to use, especially if it was stored properly in a cool, dark place. However, it's essential to perform a sensory check before reusing it. Look for any changes in appearance, such as cloudiness or sediment at the bottom of the jar. Smell the vinegar; if it has developed an unpleasant or 'off' odor, it's best to discard it. If the vinegar looks and smells normal, it's likely safe to reuse. Consider filtering the vinegar through a cheesecloth or fine-mesh sieve to remove any spice particles before reusing it, as these particles can continue to break down and affect the flavor and clarity of the vinegar over time.
To extend the shelf life of your spice-infused vinegar, store it in the refrigerator. The cooler temperature will further slow down any potential microbial growth and help preserve the flavor and quality of the infusion.