The Book on chemicals, or Volatile chemicals - Experimental Test Notes, is part of The Dig Site quest. It has some information on how to make a Chemical compound that can be used to destroy some blocks.
After the quest it can be found on the shelves in your house.
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 with certain chemicals and invented a compound of tremendous power that, 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…