If you are using household concentrations you won't generate enough chlorine gas to be harmful in a ventilated area, like outside. If you put it in a bag and huff it you are going to have a bad time, but enough to cause damage can be tossed into a mason jar, shaken, and thrown pretty safely.
despoticruin
The acid makes it rust in seconds instead of days though, instantly visible and quite permanent damage.
Well, a 1:1 mixture of chlorine bleach and vinegar should damn near instantly and permanently corrode the steel. Don't breathe the fumes, but I have toyed with the idea of a squirt gun filled with instarust.
The silicon die could easily chip a tooth as well, the stuff is insanely hard.
While this could work, please don't go firing a laser powerful enough to set shit on fire randomly into the air. It's like firing a gun, that laser will fuck up whatever it hits and you don't know what's behind that flag. Easy way to kill a plane full of people by instantly and permanently blinding both pilots. I would look into artillery calculations and water balloons filled with bleach. Pretty easy to hit a stationary target with a pi handling trajectory calculations. Paintballs might be another option, bright pink.
Excellent idea