This section is from the "Elixirs And Flavoring Extracts. Their History, Formulae, & Methods of Preparation" book, by John Uri Lloyd. Also available from Amazon: Elixirs and flavoring extracts,: Their history, formulae, and methods of preparation;
Ammoniacal glycyrrhizin, 128 grains.
Simple elixir, 16 fluidounces.
Dissolve the glycyrrhizin in the simple elixir, and filter if necessary.
Each fluidrachm (teaspoonful) of the finished elixir contains one grain of ammoniacal glycyrrhizin. This elixir is used to disguise the bitterness of quinine; but it must be remembered that quinine will not dissolve in it, and that quinine is precipitated by ammoniacal glycyrrhizin from solutions which are not strongly acid. Hence the reason for the tastelessness of quinine under these conditions is largely due to its insoluble state. Such mixtures should be shaken before taking each dose, and under no condition should the mixture be filtered, as the quinine will then remain on the filter paper. The above formula is that of Prof. Joseph P. Remington.