Gunpowder and Ammunition, Their Origin and Progress

by H. W. L. Hime

The solution is then “taken and boyled of new.”

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

When the solution boils and throws up scum, it is treated with a mixture of “3 parts of oke asshes and 1 of lime, together with 4 lbs. of rock alum to every 100 lbs. of the mother liquid.” “In a little time you shall see it alaie, both clear and fair and of an azure colour.”

C. Removal of insoluble impurities.

The heavy impurities, which sink to the bottom, are got rid of by pouring the clarified mother liquid into another vessel.

G. Crystallisation.

“Take it out and put it in vessels of woode or of earth that are rough within, with certain sticks of wood, to congeal.”

I. Washing and drying.

“This same saltpeter being taken from the sides of the vessel where it congealed, and in the water thereof washed, you must lay it upon a table to drie throughly.”