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;
Elixir of cinchonidine, 8 fluidounces.
Elixir of pyrophosphate of iron, 8 fluidounces.
Mix them together, and then gradually add of ammonia water or acetic acid an amount sufficient to render the liquid of neutral reaction and transparent, then filter it if necessary.
Each fluidrachm (teaspoonful) of the finished elixir contains one grain of pyrophosphate of iron and one-half grain of cinchonidine. The remarks concerning elixir of pyrophosphate of iron with strychnine are adapted to this preparation.