Here is my technique for preserving chili in vinegar. I've never encountered any problems. This can be using a small container, so as to keep a shaker handy on the table, or for concentrated vinegar that will need to be diluted with vinegar prior to use. Chilies may be fresh or dried. I primarily use a chili "native" to the Philippines, called 'sili'. Sili is an extremely hot yet textured chili.Sili is about 1" in length, and this is one of the hottest, so the recipe can be varied depending on your tastes. 4 oz. rice vinegar 6-10 chilis 1/2 - 1 clove fresh garlic Optional: Salt to taste Put chili and garlic in small shaker type bottle. Add vinegar and salt. let sit for one day. That's it. It can be stored at room temperture for up to 2 months. Joe