Anyone recognize this case coloring?

[Bruce Day]

I am not aware that the Del Grego shop ever did case coloring by any method. They neither had the room, equipment or expertise.

I am aware that the Del Grego gunsmithing ship would strip frames, polish the metal , and take metal parts to be color case hardened to an industry shop in the Ilion area which did that type of work for a variety of industries in the area. I have no direct knowledge of the above but was told this by the Del Grego shop. Thus when the shop says or implies “we did” it’s more accurate that “ we took it to ——-“.

My knowledge dates from the 1980’s on. I do not know what contractor or industrial shop did the Del Grego requested case color work in the 1950’s to the 70’s. I don’t know the name of the shop but was told by Lawrence that it was a couple miles from their home workshop.

[edgarspencer]

Originally Posted by Bruce Day

I am not aware that the Del Grego shop ever did case coloring by any method. They neither had the room, equipment or expertise.

I have heard this stated before, and partly because of my metallurgical background, I am inclined to believe it is correct. I spent quite a bit of time with engineers from Colt Industries, at their West Hartford, CT plant, developing cast steel (CA6NM) heat treating boxes, and their plant metallurgist said they would never consider replacing the carbon based packed boxes with cyanide salt because of the environmental and safety concerns handling the salts. There was a Heat treat shop in Hartford that did cyanide packed heat treating, and they went out of business when the state DEP mandated closed-capture exhaust systems for all their furnaces.