In this seedling it looks to me as if top epidermis has Ae (anthocyanin enhancement ) and botton layer doesn't.
From: Linda Mann <email@example.com>
Sent: Sun, Oct 18, 2009 1:17 pm
Subject: [iris-photos] Re: HYB: not reblooming whodad kids
Seems like that's the case for the "umbrata"/variegatas - darker "spot"
on the surface.
You think it's an extra layer of cells just in the dark part or a
pattern of light and dark in the top layer?
<Interesting how it is so dark on top of falls and so light underneath.