Case Color Recommendations

[OH Osthaus]

Originally Posted by Paul Harm

I have a question. I've read on another web site that there is color case hardening and case coloring. The second one is done at a temp, but not enough to case harden the parts. It's more of a chemical process. It was also said that Turnbell [ along with at least Pietta ] uses the second process, but no talk if they also used a hardening process. Can anyone shed any light on this ?

TURNBULL replicates case colors which is an attractive result of the hardening process . The process involves bone charcoal and heat and skill


an after thought- some later case color was done with a cyanide process- its a boiling process so not as much heat and little if any hardening