Bill, according to TPS, Remington used a bone and charcoal case hardening process but were not able to exactly duplicate the Meriden colors after the move to Ilion. However, Remington continued to use the bone and charcoal process up to the end of Parker production when the war put an end to sporting arms manufacture. After the war Remington ceased the bone and charcoal process and used the cyanide process and Del Grego would bring his frames to Remington for color case hardening in the fifties and maybe even as early as the very late forties from what I have read.
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