propane torch can melt both I believe but you'd need oxygen to get hot enough to melt titanium, aluminum won't glow red, it'll just melt, and titanium will take a while to melt, and long before it'll turn red and glow.
Aluminum melts around 1200 F, Titanium melts around 3000 F so you could hope you've got a titanium one an heat it until it glows red....or melts because it's aluminum..[sad][smirk][up][down]