W, you may be asking yourself, TF is tritium. Its a radioactive isotope similar to Radium. Except that it glows continuously for around 10 years regardless of its environment. So its not reliant on ambient light like Radium. Its one of those things that Ive known about for ages and thought was cool but had no use for. Until today I stumbled on these:
http://cgi.ebay.com.au/Tritium-Zip-pull ... dZViewItem
Which look to me to be a cracker of a buy for under $15.
Perfect for zippers, torch handles etc. even hang of the iPood!