Thanks to Cody for telling me this aired again. (Check out her unbelievable photos of the Springfield tornado!)
When I do demos I pass these eyeglasses around for the audience to see how the didymium lenses filter out the sodium flare in the flame. I love telling people, "Martha Stewart wore those!"
Welcome, first- time visitors! Check out the links in the toolbar on the right. Here's more info on glass torch resources to get started yourself! Wale Apparatus has a great selection of stuff, and wonderful service.