Each group was also shown the effectiveness of the inexpensive ABC or BC dry chemical extinguishers, again using a short well-aimed blast at the fire. However, during one of my demonstrations, I accidentally grabbed the halon extinguisher that I had used in a discussion of different fire-fighting agents. I pulled the pin, aimed the nozzle and let forth a brief blast of banned, terrible-for-the-environment, not-Sierra Club approved halon Read more