Potassium permanganate and glycerin. That was also a favorite with me, Raparee.
I got a lickin over it. I mixed it on the settee arm one time. A burn spot that couldn't be repaired.

The most dangerous one of our group tried was a metal pipe, a wax seal in the middle, water at one end and carbide in the other, ends capped. Tossed over a cliff and blew a shed below.