Unless I am mistaken, if you take a rag and Simichrome, or Blue Magic metal polish to Ti, it won't turn black like Al does. So this may be a quick way of determining if something is made of Al or Ti. Please correct me if I am wrong.
Neill Currie Hillsborough, Nh, USA.
My blog, bike related, I think, is at http://blogericious.blogspot.com/
The Mountain Goat bicycle website is located here:
http://www.geocities.com/