This appears to be semi-official RAL color pallet/swatch. The Uboat colors are from their "Classic" set. This is very helpful : )
https://ral-colors.us/ral-classic-colors/
From which, I collected these swatches comparing them to the ones I found from other sources, as well as the text descriptions, such as translated: "Ivroy" give me confidence that the RAL colors are correct.
(For some reason, my dropbox links don't work.)
https://www.dropbox.com/s/pdgg7j238i...olors.jpg?dl=0
Official German UBoat Painting Rules, text translation:
https://www-u--boot--archiv-de.trans..._x_tr_pto=wapp
...which has color codes for the whole submarine--including No. 58, which is likely not RAL.
Noting that: given the lighting and narrow white balance, this sub was pretty-well color matched, showing blue hues in the grey, and cream in the white, perhaps a bit saturated from the incandescent light. There are a lot of coats of paint on this thing, with drips and hangers, that likely would not be present in the 1940s. The orange/red is totally blown out. Perhaps there's a florescent in there, exciting it.
