Anyone wanting to know how to Colour Case Harden steel should read the following Forum:-

http://www.marlin-collectors.com/forum/viewtopic.php?f=21&t=3732

This runs to fifteen pages and details one mans experiments on CC Hardening. I have found no better source of information on this subject anywhere.(I've been looking for several decades).

He details the ratio's of the charcoal and bone charcoal, the methodology and the temperatures and equipment used. It's well worth a read even if you never intend to CC harden yourself. It also removes a lot of the mystique and bulls**t of CC Hardening that abounds on other boards.

It's worth viewing, if for nothing more than just the pictures.

Harry

Biology is the only science where multiplication can be achieved by division.