So...
Let's See Your... Case Hardening (or Coloring)
Let's also try to avoid the "case hardening" versus "case coloring" debate for this thread -- just show us what you got -- but please do identify the "maker and the method used", if known.
Get your drool rags ready, 'cause I know some of you guys have beauties that make mine pale in comparison.

OK, I'll start -- see below...
Old No7
( Click on any image to enlarge )
Colt Signature Series 1861 Navy
Bone case colored/hardened by Colt Blackpowder Arms
Remington Rolling Block Schuetzen
Bone case colored/hardened by Lee Shaver, Lee Shaver Gunsmithing
Dickinson Estate 20ga Shotgun
Bone case colored/hardened by Akus in Turkey
H&R Officer's Model Trapdoor
Case colored/hardened by H&R, method unknown
(Looks similar to the color patterns made by CPA Rifles)