apparently companies are substituting 5% acidity vinegar with 4% acidity in the gallon jugs you buy when you're canning. nice subtle move from some MBA except that people's canned food won't be shelf stable
wild that this random post is how I found out that 4% vinegar has been the standard here in Australia for long enough that the csiro just say βmultiply the vinegar amount in overseas recipes by 1.25xβ
edit enough people shared for me to be uncomfortable leaving the above unsourced so: https://www.csiro.au/en/research/health-medical/nutrition/vegetable-preservation#:~:text=Be%20wary%20of%20using%20American,4%20per%20cent%20acetic%20acid.
