After opening kimchi, always refrigerate it promptly. Use a clean utensil each time you take some out to prevent introducing bacteria and spoilage.
Kimchi is a fermented food, and while the fermentation process creates an acidic environment that inhibits the growth of many harmful bacteria, it's still susceptible to spoilage if handled improperly. Once opened, the jar should be stored in the refrigerator to slow down any further fermentation and prevent the growth of unwanted microorganisms.
Using a clean utensil each time you serve yourself kimchi is crucial. Introducing bacteria from your mouth or other foods can contaminate the entire jar, leading to mold growth, off-flavors, and a shorter shelf life. Always use a clean spoon, fork, or chopsticks to remove kimchi from the jar. Avoid double-dipping or using utensils that have touched other foods.
To further extend the shelf life of your kimchi, ensure the kimchi is submerged in its brine. The brine helps to protect the kimchi from exposure to air, which can promote spoilage. If necessary, you can add a small amount of filtered water or brine from another jar of kimchi to ensure the kimchi remains submerged.
If you notice any mold growth, unusual odors, or significant changes in texture or color, it's best to discard the kimchi, even if it's before the expiration date. It's better to be safe than sorry when it comes to fermented foods.