what is grain vinegar
What does the term 50 grains mean on the HeinzÂ® Vinegar label? A vinegars grain is a number used to specify its acetic content. Grain is 10 times the percent of acetic acid present. For example, all HeinzÂ® bottled vinegars are at least 50 grains, which means they contain at least 5 percent acetic acid and are called 5 percent vinegars. It's important that vinegars are 5 percent, because this amount of acetic acid is necessary for safe and efficient food preservation and household use.