This section is from the book "A Treatise On Beverages or The Complete Practical Bottler", by Charles Herman Sulz. Also available from Amazon: A Treatise On Beverages.
Prepare by neutralizing 12 ozs. of citric acid with ammonia 11 fl. ozs., or sufficient, and add distilled water to yield 20 fl. ozs. of product. Store in bottles free from lead. Spec. grav. 1209. Citric acid combines with ammonia, forming ammonium citrate and water. The solution is clear and colorless, has a saline taste, and should not change either litmus or turmeric-paper.