Is Snow White with the Red Hair manga available in colour? Or is it only in black and white?
There doesn't seem any colored version of Snow White with Red Hair manga.
The list of the published printed manga on Japanese Wikipedia only listed 1 series, which doesn't seem to be in color (just a normal black & white).
Googling 赤髪の白雪姫 漫画 カラー版 (Akagami no Shirayukihime manga COLOR ban, "Snow White with Red Hair" manga colored version) also didn't give any convincing proof whether there's a colored version of the manga either.
Searching on eBookJapan (Japanese) also didn't list any digitally colored version.