weathering a saber

Can any one tell me what kind of technique that Vader'svalt used to weather the heretic saber?


http://www.youtube.com/watch?v=6D8S9ZkA4eA

I may be wrong but it looks like he used aluminum black.

Here's a thread about it.
http://forums.thecustomsabershop.com...and-Weathering

Actually the first post in this thread mentions that same saber in the Video: The "Heretic".

Thank you very much man, this helped a lot.