Cadet,
The best commercial solution is the Mark Lee solution. I believe you can buy it from Brownells.I have had great results with it on twist and 2 and 3 bar damascus.
Brownells site http://www.brownells.com/.aspx/cid=11270/Products/Blackening-Browning

Last edited by Stallones; 06/29/12 12:16 PM.