Cable not quite know

The cable itself does what it should, but it should be noted that at least that's what I have been delivered from media-hall (30m of Hilbotron), is not entirely white. On the outside of one of the two strands runs a black band, so you can unterschreiden the two conductors, so that the cable from one side of looks considered black. This does not affect functionality, but could be buying decision for one or the other.