Traditional way
This is the method to produce and use explosive substance by mixing diffrend chemical substance, this practice start to be used by shinobi early according with some old documents. This method was useful to destroy solid gates from the entry of a palace, some used even to put down some walls.
Modern way
In our modern days this is studied in military academy, police task force or diffrend secret services arround the world, were officers learn and study different type of combination's and the impact of these in metal, stone or woods.
