Nigeria color varieties on 50-naira notes reported

Aidan Work has reported varieties in the coloring of the 50-naira (US$0.35) note of 1991 (Pick 27). As you can see from the details above, the head scarf worn by the woman on the front of the note is entirely blue on one note (left) and black and blue on another (right). Also, the shorts worn by the man on the back of the note are also blue on one and black and blue on the other. There are other subtle color differences on the sample scans submitted.

Can anyone else confirm these color varieties in their collections? Please post comments to help resolve this issue.

Courtesy of Aidan Work.