Shiloh Sharps in Big Timber, Montana, do a magnificent job. They do both Bone/Charcoal and Cyanide dipping. A friend sent his Sharps Borchardt there for a Bone/Charcoal finish. It's not cheap, but I've never seen better. The action and parts had been finished polished and engraved so there was no preparation work for Shiloh to do. Cost around $400.00. They have a website with contact Emails and Phone. Ask for Lucinder, she'll give you a quote.
If your action has been previously CC hardened, it will require anealing first. This is a simple process but has to be carried out in an 'Inert'atmosphere' so no scaling is produced on the surface of the metal.
There are several other firms that do this work, some perhaps cheaper than others, but, anyone who buys on price alone is a salesmans lawful prey.
Harry
Last edited by Harry Eales; 01/20/13 08:04 AM.