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 calisaya, 8 fluidounces.
Tincture of chloride of iron, 1/4 fluidounces.
Solution of citrate of ammonium, 1 fluidounces.
Fluid extract of gentian, 1/4 fluidounces.
Distilled water, carbonate of magnesium, of each a sufficient quantity.
Triturate the fluid extract of gentian in a mortar with carbonate of magnesium in amount sufficient to form a thick paste, and then gradually add eight fluidounces of distilled water, filter, and bring the filtrate to the measure of seven fluidounces by addition of distilled water. Mix the solution of citrate of ammonium with the tincture of chloride of iron, and add to the gentian filtrate, and then add the elixir of calisaya.
Each fluidrachm (teaspoonful) of the finished elixir contains about one minim each of tincture of chloride of iron and of fluid extract of gentian, and represents about two grains of calisaya.
The remarks applied to elixir of calisaya and chloride of iron with ammonium citrate, are applicable to this preparation.
The National Formulary prepares this substance from tincture of citro-chloride of iron. The product is similar to that produced by our formula.