At risk of complicating the issue further, I’ve spent FAR too many hours on the question of LMS (1930s) paint schemes or rather shades and lettering. I learned long ago the definitive source on the subject was the book – “Locomotive Liveries of the LMS” by David Jenkinson.
Eventually securing a used copy and yes, it covers just about every aspect of LMS Scots’ type-face, colouration, etc including a fold-out page purporting to all show the actual colours. But time and paper deterioration have rendered the colour samples fairly useless.
The book emphasises how very much the LMS colours varied according to where the Scots were built and why. For example, only some works “rubbed down with brick dust” others used different primers, undercoats and particularly varnishes with subtle changes in final shades.
I did though produce to the best of my ability a colour “chart” of LMS colours for the 1930s but as you’ll appreciate that my computer screen’s calibration, my Epson colour printer etc wouldn’t necessarily reproduce “correctly” on someone else’s desktop gear. Nevertheless, it is shown below. It shows Crimson Lake, buffer-beam red and “pale straw” that being official LMS shade name. FWIW (and that’s maybe not much), Rover Damask Red aerosol spayed onto a “lead” (dark orange) primer is the closest match to the NRM’s Crimson Lake. Of course, there are “Crimson Lake” labels within CMYK, Pantone etc but their resemblance to the LMS version is minimal
In summary, Jenkinson’s book remains the best guide for Midland & LMS colour & lettering schemes. A copy of the book is well worth tracking down IMHO.