While reading, I shared that feeling regarding colors and images, but, on the other hand, digital color will be always off. (You really need a well known process for this, like Ektachrome transparencies with a color key card in the image for reference. But as you scan it, and maybe also convert color profiles in the process, all the reference is gone. And as for digital photos, camera sensors are all over the place, and we haven’t even mentioned in-camera processing.) Looking for well known color references (like Pantone or other color systems) is probably a more realistic approach to conveying the information in a “portable” manner.
That said, I found the blue paper-white in the “natural light” images mildly amusing, as well. However, for the purpose of showing similarities and/or differences, it’s probably still better than adding white balance in post production, which will result inevitably in some loss of the relevant information. (Adding white balance will be just squishing a color channel on one side of the reference point and spread it on the other one, and we’re speaking here about a representation in purely unsigned integer numbers.) So, on second thought, showing the images as-exposed was actually the right thing to do.
(And, as the images are that noticeably off, I guess, it was deliberately done so, showing some consideration.)