Volatile Chemicals - Experimental Test Notes.

In order to ease the mining process, my colleagues and I, decided we needed something stronger than picks, to delve under the surface of the digsite. As I already had an intermediate knowledge of herblore, I experimented on certain chemicals, and invented a compound of tremendous power, which, if subjected to a spark, would literally explode. We used vials of this compound with great effect, as it enabled us to reach further than ever before. Here is what I have left of the compound's recipe:

1 measure of ammonium nitrate powder,
1 measure of nitroglycerin,
1 measure of ground charcoal
1 measure of ?

Unfortunately the last ingredient was not noted down, but we understand that a certain root grows around these parts that was used to very good effect...