I have searched the VFP online documentation high and low and can find nothing that specifies the mapping from each of the 10 color pairs in a color scheme to the particular screen attribute controlled by each.
Since color scheme's seem to be a MS Windows construct, I even looked in Windows documentation for the desired specs, but could not find them.
"The Iron Fish: The water is cold...but the fish don't mind"
...Jay Jenks, boyhood chum