Gunpowder and Ammunition, Their Origin and Progress

by H. W. L. Hime

B. Boiling the solution of grough saltpetre.

Pulverise the crystals of grough saltpetre thus obtained, and immerse them in water. Make a powder of two purifying substances in the proportion of 3:2. Dissolve the crystals over a gentle fire.

F. Use of wood-ash, charcoal, &c.

To the powder add some animal charcoal, and thoroughly incorporate the ingredients (in a vessel). Then pour the hot solution upon it, and your object (of clarifying the mother liquid) will be gained.

C. Removal of the insoluble impurities.

If (by its appearance and taste you judge that) the solution is good, pour it out (into a crystallising vessel, leaving the heavy impurities behind).

G. Crystallisation.

(The mother liquid is now allowed to crystallise.)

H. Stirring the depositing solution.

(While depositing), stir the solution with a pestle. Collect the crystals as best you can, and gradually draw off the mother liquid.