I’m now preloading and reassigning colors to the sovereignty holding alliances per map. The assignment will affect all alliances that had at any point of my history database sovereignty in one or more systems of that map, ordered by the first date an alliance had sov.
The currently defined 18 colors will get mapped to all alliances that occurred in the history. If the 18 colors have been assigned, the colors will get reused. It might happen that particular maps alliances may have the same color. This is mostly in Regions where many alliances are living together and sovereignty is switching very often (like Querious).
On the other side this will make sure that an alliance should have the same color on that map, if your rollback in time.