This section is from the book "Beverages And Their Adulteration Origin, Composition, Manufacture, Natural, Artificial, Fermented, Distilled, Alkaloidal And Fruit Juices", by Harvey W. Wiley. Also available from Amazon: Beverages And Their Adulteration.
There are various after-dinner drinks which are grouped under the name of pousse cafe. The simplest Pousse cafe is a small glass of brandy. Various liqueurs of different colors are used in making the compound pousse cafe, which is very attractive to the sight and which is built up in the following way: A few drops of a heavy syrup is placed in the bottom of a conical glass. This is followed by liqueurs of different characters, arranged in the order of density. These liqueurs also have different colors, so that in pouring them into the glass each one remains as a separate layer. The top layer usually consists of Kirschwasser or Maraschino, that is, brandy distilled from cherries. The liqueurs which are used are usually some of the following: Benedictine, Chartreuse, Curacoa, and cherry brandy. Any other liqueurs may be employed, which have the required density, taste and flavor.
 
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