paper cartridges
just some one liner tidbits gleaned from various sources.
The earliest known complete purification process for potassium nitrate was outlined in 1270 by the chemist and engineer Hasan al-Rammah of Syria
A major natural source of potassium nitrate was the deposits crystallizing from cave walls and the accumulations of bat guano in caves.
Historians note their use by soldiers of Christian I in 1586, while the Dresden museum has evidence dating their use to 1591, and Capo Bianco writes in 1597 that paper cartridges had long been in use by Neapolitan soldiers.
Paper cartridges were often coated in beeswax, lard, or tallow, which served a number of purposes. It provided some degree of water resistance, it lubricated the paper-wrapped bullet as it was pushed down the bore, and it melted upon firing to mix with the powder residue and make the resulting fouling easier to remove.
The paper also served as a patch in smoothbore firearms, which fired undersized balls sealed in the barrel by a paper or cloth patch.
The paper used in cartridges varied considerably. The instructions for making Enfield paper cartridges, published in 1859, which uses three pieces of paper of two different thicknesses, shows the complexity that could be involved. Some cartridges, such as those for percussion revolvers, used nitrated paper. Treated by soaking in a potassium nitrate solution and then drying, this made the paper far more flammable and ensured it burned completely upon firing
Some commercially produced cartridges, such as those by Hayes of England, were also equipped with a small cloth tear tab at the front to assist in the removal of the protective outer layer prior to loading the cartridge.
The Colt 1861 Navy typically was used with paper cartridges, that is, with a cartridge consisting of nitrated paper, a pre-measured black powder charge, and a bullet that was either a lead round ball or a lead conical bullet.
Ripping off the back of the paper cartridges took time. In the heat of battle, instinct is to ram and fire fast. That is, ram the new powder charge and bullet down the barrel as fast as possible. To do that, the entire paper cartridge was rammed down the barrel either opened or unopened. For this purpose, the paper had been soaked in potassium nitrate to make it completely combustible. Both the powder and the paper used in Civil War ammunition was highly combustible. Keep the cartridge box away from the campfire sparks!