Quote:
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.
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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.