When browsing the net for handle materials, I found a lot of information about production knife handle materials, but nothing about the ones that custom knifemakers usually use. I thought that a list of those would be helpful, so I wrote an article that collects the more exotic knife handle materials that a custom knifemaker can use:
https://makesg.wordpress.com/2015/07/15/exotic-knife-handle-materials/
Please let me know what you think. Also, I'm aware that the list is far from complete, so any ideas are welcome.