Perfectly Preserved Podcast Ep 51 - The Great Vinegar Conspiracy
This is kind of a rabbit hole topic, but we saw a post from the USU Extension Office Instagram account regarding a vinegar that is 4% instead of 5% in the grocery store. I personally have never seen this, but it's definitely out there. The 4% vinegars generally are produced to save money for the producers. Some people use 4% vinegar for homemade dressings and cooking.
Jenny and I both encourage you to use ONLY the 5% concentrate vinegars in home canning recipes.