Section 163. Vinegar is hereby defined as being the result of alcoholic and subsequent acetous fermentation of natural fruit juices or vegetable products. Vinegar shall contain no added or artificial coloring matter, and shall contain not less than four grams of acetic acid in each one hundred cubic centimeters. If vinegar contains any added or artificial coloring matter, or less than the required amount of acidity, or if it is other than the product of alcoholic and subsequent acetous fermentation of natural fruit juices or vegetable products, it shall be deemed to be adulterated.