Why are the Welsh Celts dark, while the Scots Celts are mainly fair in their colouring?

The Welsh are considered to be the only Northern Europeans considered to be predominantly dark-haired, dark-eyed, and olive skinned. Yet, the Celtic peoples of Scotland are predominantly fair. Interestingly enough, the Irish seem to take a middle ground with most posessing dark hair but blue eyes. Because of... show more The Welsh are considered to be the only Northern Europeans considered to be predominantly dark-haired, dark-eyed, and olive skinned. Yet, the Celtic peoples of Scotland are predominantly fair. Interestingly enough, the Irish seem to take a middle ground with most posessing dark hair but blue eyes. Because of their dark colouring are the Welsh in actuality descendents of Romans and not Celts?
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