An aqueous solution of acetic acid and trace chemicals that may include flavorings. In much of the vinegar industry the terminology, grain, is used. In this terminology, 10 grain is 1% acidity so 50 grain is 5%, 100 grain is 10%, etc. The term grain came from an alternate measure of weight, the grain. By dissolving a base like sodium bicarbonate or sodium hydroxide in water, you could measure how many grains it took to neutralize vinegar of a specific strength and volume. In the most common formulation, it took 10 grains (presumably of sodium hydroxide) to neutralize 1% acetic acid so the usage of grains for vinegar strength became interchangeable.
100 Grain Vinegar
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