Thanks, gives me some idea.
Don't know of DT Tried some searches but not too good at it.
I'd never heard of chem/colour, just wondering, as I have
a '67 M94, saddle ring, some scroll engraving, and was C/case.
Got it 2nd hand and most colour has been worn off.
Couldn't have been too "hardened" I thought.
May not have lasted any longer than their blued recievers.

John L.