Also note that in the period, frames had to be case hardened in order to make them operable. Alloys for gun frames not requiring hardening, like used today, were not used.
So, if frames were to be blued, they would still have to be case hardened first and then blued. An additional step, incurring more manufacturing cost, would not have been utilized on an economy grade gun designed to cut costs.
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B. Dudley
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