<font face="Verdana, Arial" size="2">good thing thats titanium and not magnesium. I was at the drag races and saw a vintage spoked racing wheel catch fire after a wreck it was rather interesting.</font>
Ti burns hotter than Mg. Fortunately, though, it's not self-sustaining as Mg is. Furthermore, it's a lot harder to set Ti on fire. You're not gonna get there with a propane torch. The big risk with Ti is grinding in on high-speed equipment or dust from grinding, machining, cutting, or other similar operations.
A lot of folks worry about destroying the temper of their blade by flaming the handles. Well, to affect temper, you have to raise the temperature above the last heat treat cycle. I don't know what that temperature is, but the lowest heat treatment protocols in use are still well above 300, and those are exotic. I'd guess that the final heat treat for the 42's blade is in the 400-450 range. But, even if it's just a bit above 300, well, water boils just a bit above 200 (depending on altitude). So, as long as you don't get the blade hot enough to boil water, you've got at least a hundred degrees of margin.
Start at the latch end and work up. Just keep flaming until you get colors you like. Obviously, keep away from the blade. Then, quickly cool it by dunking it in water.
The colors you'll get will be completely random and will probably not be solid. Reds and oranges and yellows, and even some great blues tend to show up a lot. The colors tend to be very irridecent and change with light.
Mine have proven quite durable.
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Chuck
Balisongs -- because it don't mean a thing if it ain't got that swing!
http://www.balisongcollector.com