Woody , this is a great subject ! is this ingredient long overdue for serious discussion on the CH list ... or what ? i'd hoped that one of the CH hot-sauce Pro's would respond to your question, but they must be busy doing all that Evil Corporate stuff ! i'm sure No expert, but i'll happily "weigh in" with an opinion here. it's a fact ... lotsa people like hot sauces. ( CH's as well as non-CH's ) and any cursory check of ingredients, of any average grouping of hot sauces (try the batch inside Your fridge), will quickly prove that vinegar is often a predominant ingredient. ( food ingredients are listed on labels "in descending order of predominance". e.g. "Ingredients: Pinto Beans, Water, and Salt" http://www.cfsan.fda.gov/~dms/flg-4.html ) vinegar is quite often the first, second, or third ingredient listed for a hot sauce; and considering vinegar's rather forward flavor profile, it can contribute mightily to the overall taste of any sauce. we might not want to admit it ... but lotsa folks seem to enjoy vinegar with chiles! (count me In) ... otherwise most of those Hot-sauces wouldn't get sold. so, which vinegar is best? that prolly depends on Your individual taste buds . try using the vinegar that you prefer for cooking, salads, pickling etc. as well, consider the way any vinegar will balance with the other ingredients in your sauce. like, salt, sugar, the Chile variety, spices, citrus or other seasonings etc. as for the preservative thing ... yep, vinegars can inhibit some bacterial growth. how much, of what type, in what recipe, at what PH etc. leads to more Q's. don't just count on the vinegar alone to do the preserving. frankly, i suspect that the Vast majority of hot-sauces are Heat Processed to prevent spoilage on the grocery shelf. that plastic "security wrap" on top is there for the same reason ... when folks unscrew the cap to sniff the product, bacteria, molds, yeast etc. get in and start to do their job, thereby causing spoilage at room temperature. i keep all my hot-sauces in the fridge. anyway, my personal pick for hot-sauce vinegar ?? the hands-down Winner is ... Cane vinegar. great flavor, some residual sugars. here's an URL http://www.versatilevinegar.org/ regards peter g > >