. . . "Partial salts of such organic acids that may be employed in the present invention, include the lithium, sodium, potassium, calcium, and magnesium slats of maleic acid, citric acid, adipic acid, malic acid, ascorbic acid, succinic acid, fumaric acid, and the like. the preferred acids are the acids found in natural fruits, such as citric acid, maleic acid, and malic acid." .