Would it perhaps be worth using purple for the SFIO and blue for the bottom colour? I know those aren't their actual colours, but it may be worth it for the sake of better distinction. The yellow and orange probably don't matter so much if they're in geographically separated regions.I may have a slight problem.
View attachment 11719
This is the November 1946 National Assembly election, the first held under the constitution of the Fourth Republic (although the two previous constituent assemblies had been elected by almost the exact same system). Most seat colours should be clear, but perhaps not all - I'm going to add descriptions for those on the finished map, along with the fifth or so of seats elected outside the metropole.