justin: the particular gh that you are referring to had it's receiver recolored by ed lander, an old time gunsmith here in nh. old ed has been a full time general gunsmith since he came home from service in ww2, in 1946! imagine having the services of a gunsmith with over 60 years of experience! we in northern new england are lucky to still have him around to work on our guns.
anyway, he uses a low heat chemical process to recolor shotgun receivers. he uses different chemicals to simulate different factory receiver coloring, depending on the brand and age of the gun. for example, i have a late ithaca 20 ga nid, that old ed also recolored the receiver. it is very well done and is close to ithaca factory work of the period.
unlike the high heat bone charcoal process of recoloring shotgun receivers, old ed never heats a shotgun receiver hot enough to reach critical temperature and thus altering the original factory heat treatment of the receiver metal. keeping the heat below critical temperature avoids the well known problems associated with after market re heat treating of shotgun receivers.
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