I go along with the QSA KSA LSGC theory.
In general, greyscale photos pre-c. 1925 are ortho film which, with caveats, renders red/orange/yellow very dark, green neutral, blue pale.
The caveats involve the amount of black or white [darkening or pastel] in the originals. Pure black and pure white show as .......... surprise surprise ......
black, or white.
Simples!
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