This section is from the book "Monograph on Flavoring Extracts With Essences, Syrups, and Colorings", by Joseph Harrop . Also available from Amazon: Monograph On Flavoring Extracts With Essences, Syrups And Colorings.
The acids used in the above formulas are alcoholic solutions "saturated in the cold," which, by the way, is a comparative phrase; as cold as your store or shop would be liable to get, or at a temperature as low or lower than that to which your solution would be liable to be exposed; (the rule being, substances are less soluble in cold than in warm liquids). These alcoholic solutions would be liable to crystallize out if this precaution was not taken.
They are as follows:
Alcoholic Solutions of Acids (Saturated in the Gold).
Tartaric Acid, Oxalic Acid, Succinic Acid, Sebacic Acid. Benzoic Acid
Convenience only has caused this peculiar mode of preparing the above articles in solution, for the foregoing formulas, in which they are used.