Here are more Hulthemia petals coming from some of the new 2011 seedlings.
As is seen above, the reverse is almost always lighter than the top side of the petal. Additionally, I have never seen the blotch pigment on the reverse side. I am hoping that it will be possible though, so will continue to keep my eyes opened for it! I think that a reverse blotch would be especially nice on otherwise typical exhibition type blooms.