Flame coloring a blowtorch

Recently, I lent a friend my small butane torch, it's good for soldering and stuff. It's burns pretty much invisibly during the day, at night with a very pale blue. Anyways, he thought he had put it out, but he hadn't, and he got burned pretty bad. Is there anything I can do to pretty much permanently color the flame? I have access to lots of salts, KCl, NaCl, NaF, KF, even CsF and others. Would making a salt solution, dipping the head of the torch in, and allowing to dry work? How vividly would it color the flame? That is the important part. I can also get my hands on strontium and barium nitrate, as well as their chlorides. And yes, I know fluorides are dangerous, I like to stick to chlorides as much as I can.Thanks everyone, this forum is great.