The Mexican gunpowder dilemma

yulzari · 29th August 2019, 10:33 PM

If Mexican powder was prone to suffer from dampness it could point to using guano derived sodium nitrate instead of potassium nitrate as the saltpetre portion of the gun powder.

Sodium nitrate is a workable alternative to potassium nitrate saltpetre but is less effective and is notably hygroscopic so goes soggy when exposed after a while. It needs to be kept sealed until used. Often turned to as a cheaper ingredient or when the better is not accessible. OK as long as you use it up fast but goes soggy in storage and definitely in a weapon, especially the pan of a firelock, overnight. OK-ish for blasting or fireworks where the buyer uses it soon after purchase but firearm powder is stored until used in the future so not a good choice.

Not conclusive evidence but makes it valid to examine the possibility seriously and is at least consistent with the reports made here.

There is a process to convert sodium nitrate to potassium nitrate but that is chemistry knowledge out of period and beyond the Mexican technology of the day. A less direct route is to use the guano in 'nitre beds' but I am not aware of any being created in Mexico and is a slower and more wasteful method. Not to mention unpleasant.

29th August 2019, 10:33 PM	#30
yulzari Member Join Date: Sep 2018 Location: Limousin France Posts: 19	If Mexican powder was prone to suffer from dampness it could point to using guano derived sodium nitrate instead of potassium nitrate as the saltpetre portion of the gun powder. Sodium nitrate is a workable alternative to potassium nitrate saltpetre but is less effective and is notably hygroscopic so goes soggy when exposed after a while. It needs to be kept sealed until used. Often turned to as a cheaper ingredient or when the better is not accessible. OK as long as you use it up fast but goes soggy in storage and definitely in a weapon, especially the pan of a firelock, overnight. OK-ish for blasting or fireworks where the buyer uses it soon after purchase but firearm powder is stored until used in the future so not a good choice. Not conclusive evidence but makes it valid to examine the possibility seriously and is at least consistent with the reports made here. There is a process to convert sodium nitrate to potassium nitrate but that is chemistry knowledge out of period and beyond the Mexican technology of the day. A less direct route is to use the guano in 'nitre beds' but I am not aware of any being created in Mexico and is a slower and more wasteful method. Not to mention unpleasant.