Better late than not at all. I've quickly scanned this thread and I don't see a link to the Lizzie Roberts version, so here it is:

http://www.traditionalmusic.co.uk/english-folk-songs/southern-appalachians%20-%200355.htm

This is taken from the earlier and shorter collection that Sharp did with Olive Dame Campbell. I have been unable to find, quickly, which of these songs were collected by Campbell, before Sharp arrived. Surely that list must exist. I am curious to know if "Black is the Color" was perhaps collected by Campbell. Is there information about this in Sharp's notebooks by any chance. I've not found any mention on his part to Lizzie Roberts.