Is patis and vinegar completely mix?

Yes, patis and vinegar can be completely mixed. Patis is a fish sauce made from fermented anchovies or other small fish, while vinegar is a sour liquid made from fermented fruit or grains. Both patis and vinegar are acidic, so they will not react with each other to form any harmful compounds. In fact, patis and vinegar are often used together in cooking, as the combination of their flavors can add a depth of flavor to dishes. For example, patis and vinegar are commonly used in Filipino dishes such as adobo and sinigang.