This is an excellent method for correct color in a static architectural situation. The beauty is that it can color correct may different colors... tungsten, fluorescent and daylight... all in one process. I came up with this to combat crazy colors in a school that is closing after over 100 years of operation. My dad, I, and my kids attended it, so it has nostalgic value to me and others who might enjoy the photos.
I don't know if this has ever been done, and if not it needs a name. Until I hear a better name, I'll call it "Color Stacking".
In the first image, it's clear that the color is incorrect. That's to be expected since it's fluorescent lighting recorded in daylight balance. This will provide the brightness of the final image.
The second image was color "corrected" using a gray card to attempt to neutralize the fluorescent light. Clearly not acceptable. Fluorescent lights have an incomplete color spectrum.
The third image was bounced flash. It could also be a broad light source such as a softbox or umbrella behind the camera. This will provide the color for the final image. Place this image on top of the original image and use the "color" layer blending mode in Photoshop (or "luminosity" if it's placed below the original image).
The fourth image is the result of those two images.
Since this is done in separate exposures, this isn't for a subject that would move between exposures.