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No.
Color case hardening is delicate. Wear and sunlight fade it.
Applying chemicals like cold blue or acids will just remove it.
There are various more or less effective ways to fake color case hardening but there's no way I know of to "restore" or "refresh" it without removing what's there first.
One method that may make it look a little better is to apply a coat of lacquer or a varnish type coating.
Some companies applied a varnish to new guns to protect the colors from wearing or fading too fast.
A coat of gloss lacquer might make it look a little better but won't restore any of the coloring.
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