Hi, Xigung!

> I also have a note that says svartr was frequently used for
> the color of dark hair, usually of foreigners and slaves,
> e.g. "Atilla" Atli var grimmr maðr, mikill ok svartr...
> And here: 'Sörli, Hamdir, Erpr; þeir váru allir svartir
> sem hrafn á hárslít, sem Gunnarr ok Högni ok aðrir Niflungar.'
> "their hair was raven black" in other words.

Indeed, but the same dudes are called 'hrafn-bláir' in Ragnarsdrápa:

Knátti eðr við illan
Jörmunrekkr at vakna
með dreyrfáar dróttir
draum í sverða flaumi;
rósta varð í ranni
Randvés höfuðniðja,
þás hrafnbláir hefnðu
harma Erps of barmar.

Finnur Jónsson translates:

"Fremdeles [ses, at] vågnede Jörmunrekk som af en ond drøm
tilligemed de blodbestænkte skarer i sværdtummelen; der opstod
kamp i Randves faders hus, dengang da Erps ravnsorte brødre
hævnede deres sorg."

Source: http://www.hi.is/~eybjorn/ugm/test.html

Kveðja,
Haukur