Fire bluing, or 'Nitre blue'?

[Hugh]

Originally Posted by TennBill2

Can never find what I want! There was a Borchardt on the web with close-up pics labled: 'Fire Blue'. That and something I read referrred to the process led me to think that was what was done.

The small parts were fire blued, not the whole gun. "Fire Bluing" can also be done in your kitchen oven if it will heat up to 550 degrees. I do strawing and fire bluing in my electric kitchen oven. If you don't get the color just right, it polishes off easily and can be redone. The secret to a good job is a high polish and absolutly clean of any oil (including body oil from your fingers!)