The Joe Rogan Experience
#2225 - Dave Smith
Unknown
...continued for six to seven days or until an egg could float on the surface. At this time, lime and ash were added, which caused the included common salt to crystallize and could thus be removed. The whole thing was then allowed to cool down to about 25 degrees when the saltpeter began to crystallize. The raw saltpeter was then transported to the gunpowder mills.
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