I was wondering how to change the colours of ships in naval battles.

Which file controls the ship colour for each specific faction? I believe it is similar to units, the normal file simply telling the game which regions of a texture to colour with the specific faction's colour. However, I can't seem to locate the place where the ship colours are specified for each faction.

Factions.db has a series of rgb value combinations (6 to be exact). Is it maybe one of these?