About Painting of French warship, the info I have are (main source is the excellent serie of books about the french torpedo boats and destroyers published by Marine Editions)
1908:blue grey (looking darker than the grey used before)
08/11/1929:light grey (mix of white and black
only)
26/08/1931:red-brown paint on deck not covered by linoleum (paint has about the same color than the linoleum)
09/12/1937:glossy light grey
1937:temporary national markings on some main guns of ships operating around Spain (civil war), became permanent markings in Sept 1937 for ships based in Toulon till April 1939
06/01/1940:dark grey for ships operating in the North Atlantic
A light
blue grey "similar to today's French Navy tint" reapplied when ships got back to Toulon and the Mediterranean.
17/07/1940:national markings reapplied on some of the main guns
I don't have my litterature about the La Galissonniere cruisers class here but I remember that decks and roofs were dark grey (either natural metal or paint?), linolem or wood (some ships had linoleum, others wood deck at the stern).
About the reddish paint at the fore part of deck, check this painting from Marin Marie, a great painter who if I remember well was at Mers El Kebir during the sad events of 03/07/1940 (anyway he was in Noth Africa and he was an official painter for the French Navy). Here we have Dunkerque battlecruiser (Noth Atlantic area dark grey) and La Provence battleship (which have no wooden deck, Mediterranean area light grey).
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Same tint appears on Normandie
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The 10000t cruiser Duquesne at Paris Marine museum also has a reddish foredeck (so does the Dunkerque battlecruiser in the same museum)
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However the last 10000t cruiser Algerie in again the same museum has a dark grey foredeck...