Hello folks, I think this may be my first post on this forum, been lurking for quite a while, and in the middle of two 1/48 aircraft builds at the moment, after a prolonged mojo break! I come from an art and design background, lecturing at FE &HE levels on colour theory amongst other subjects (photography, digital image making and moving image).
I find it fascinating reading about colour and scale modelling, mostly as there are so many threads, delivered with such authority, about what colour something was painted, and how to replicate this colour. Firstly, even if (more on this later!) we had the exact pigment make-up of a specific colour from 60 odd years ago, it would be only a starting point in determining what to use to paint our model. Colour and surface finish are very much subject to scale, as much as physical detail is. Even if we had a paint that matches exactly, the original paint (and this can only be hypothetical, for countless reasons) it would still not look right at 1/35 per 1/48. The saturation would appear too high and the surface too thick. Surface finishes, such as gloss, satin, eggshell what have you are all affected by this phenomena, so we will always end up making a judgement call on how to modify this in order for it to look "right". This is before we even approach the subject of pigment quality, provenance and different binders and solvents. To be pedantic (!) the only way we could truthfully know what colour that Spifire's nose really was, would be to have acces to a photograph, taken at the time it was in service, with a Kodak grey card in place (to pinpoint exactly the right colour) and then kept in total darkness for the last 60 years - and that would still have to take into account the change in photographic sophistication over the years! No, the best we can manage is an impression, and I don't mean this in any derogatory way at all, fine-art masters have known this for centuries!
There are countless beautiful models on this forum, I continue to be staggered at the skills of so many folks on this and other forums, and the colour choices people make, usually informed by research, and underpinned by intuition, are as good as it can ever be, and this is something to celebrate, in my opinion. There are simply too many variable parameters standing in the way of trying to use "science" to select the correct colour - bearing in mind also, that the human brain cannot retain a colour in memory, I suggest that we rely on the judgment and intuition that I alluded to before!
I write this as a point of discussion, not as a creed - personally I believe it frees us up from an unachievable goal, and, of course, stimulates more discussion and debate. I hope you'll forgive me for going on a bit!