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is there a way to redo the coloring on the frame that won't break the bank or require a degree in chemistry?
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Color case hardening is not just a coloring process, it is a heat treatment process. Re-doing the color case hardening requires complete disassembly of the firearm, barrel, screws, pins, etc, right down to the frame. The parts to be heat reated are wrapped in metal foil or placed in a crucible, covered with bone pieces or charcoal, then put in an oven for heating. There is another process that requires the parts to be heated, then quenched in ferrocyanate, but due to the chemicals used it has fallen into disuse.
There are several commercial outfits that do color case hardening, be it bone or charcoal process. There are no current commercial heat treaters that use the old cyanate process, as far as I know.