I do the process occasionally. It is very labor intensive and you can get a similar color other ways. A very good article was written in "gunmaker" the ACGG publication by Dave Norin. I believe the temp. is 800 degrees if memory serves. The freshly polished and degreased item is placed in a sealed crucible and brought up to temp., Brought out after sometime and rubbed while hot with lime and a cotton cloth, repeat until desired color is achieved. High lust polish for the best results. It is pretty and durable but not one of those jobs I personally enjoy much.
