Jurri compiled a list of national colors that are used for the ingame graphs for a project of mine. Here they are:
Early Era- Early Abysia: #ff0000
- Early Agartha: #331a1a
- Early Arcoscephale: #00ffff
- Early Atlantis: #0000ff
- Early C'tis: #b3ff00
- Early Caelum: #9999ff
- Early Ermor: #804d99
- Early Fomoria: #803366
- Early Helheim: #333333
- Early Kailasa: #ffcc4d
- Early Lanka: #cc804d
- Early Marverni: #4d991a
- Early Mictlan: #4de680
- Early Niefelheim: #994d1a
- Early Oceania: #1a6666
- Early Pangaea: #00ff00
- Early R'lyeh: #00334d
- Early Sauromatia: #80664d
- Early T'ien Ch'i: #cc4d80
- Early Tir na n'Og: #009900
- Early Ulm: #336680
- Early Vanheim: #991a1a
- Early Yomi: #808080
Middle Era- Middle Abysia: #ff0000
- Middle Agartha: #000000
- Middle Arcoscephale: #00ffff
- Middle Atlantis: #0000ff
- Middle Bandar Log: #ffcc4d
- Middle C'tis: #b3ff00
- Middle Caelum: #9999ff
- Middle Eriu: #80b31a
- Middle Ermor: #804d99
- Middle Jotunheim: #994d1a
- Middle Machaka: #e6991a
- Middle Man: #009900
- Middle Marignon: #ff6600
- Middle Mictlan: #4de680
- Middle Oceania: #1a6666
- Middle Pangaea: #00ff00
- Middle Pythium: #b366cc
- Middle R'lyeh: #00334d
- Middle Shinuyama: #808080
- Middle T'ien Ch'i: #cc4d80
- Middle Ulm: #1a1a80
- Middle Vanheim: #991a1a
Late Era- Late Abysia: #ff0000
- Late Agartha: #1a1a1a
- Late Arcoscephale: #00ffff
- Late Atlantis: #0000ff
- Late Bogarus: #801a1a
- Late C'tis: #b3ff00
- Late Caelum: #9999ff
- Late Ermor: #804d99
- Late Jomon: #808080
- Late Man: #009900
- Late Marignon: #ff6600
- Late Mictlan: #4de680
- Late Midgard: #991a1a
- Late Pangaea: #00ff00
- Late Patala: #ffcc4d
- Late Pythium: #4d9933
- Late R'lyeh: #00334d
- Late T'ien Ch'i: #cc4d80
- Late Ulm: #1a1a80
- Late Utgard: #994d1a