Yes that's true. Celts from Spain and Great Britain had dark hair. On south of GB was little bit mixed with Belgium celts (fair hair). Absolute majority of other celts had fair hair.
But I dont have any informations about fair haired slavic people.
This is typical gallic warior for me (sorry for qality I will search something better) https://media.photobucket.com/image/...handle/odo.jpg
And this is typical slavic warrior http://loft1.weltfussball.de/bilder/...gross/3542.jpg
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