C chachi First Post Jul 30, 2007 #1 The short answer is saltpeter. http://en.wikipedia.org/wiki/Niter
InzeladunMaster First Post Jul 31, 2007 #3 Interesting. It is one of the three main components of black powder, then. Bat guano can cause it. Thanks!
Interesting. It is one of the three main components of black powder, then. Bat guano can cause it. Thanks!
Grimhelm First Post Jul 31, 2007 #4 And I was partially right to say that it was a nitrogen reference!