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pigment degradation maybe?

While taking close-up scans of some of the falls from batches of seedlings from 'Flight of Butterflies' X I. setosa canadensis and I. setosa canadensis X FOB for comparison, I stumbled across something interesting.
 
Paper chromatography hasn't been useful with these groups since the pigments seem to be too similar. I was hoping that close-ups might reveal something and forgot to remove this last batch from the scanner. The falls were held down with paper so I could keep everything in place while I closed the lid. The petals were completely dry (and stuck to the glass) when I found them.
 
The samples marked "1Set2" and 1Set1-1" were from I. setosa canadensis X FOB and are hybrid given the Siberian traits starting to pop out in the F2s. The sample marked "FOB X set contrary" is the one seedling from 'Flight of Butterflies' X I. setosa canadensis that came out looking like a setosa.
 
First image is of the petals. Second image is of the stains left on the paper. Could pigments from different species degrade at a different rate? Any other ideas what might have happened? 
 
Christy
 
THE ROCK GARDEN
Newport, WA
http://www.povn.com/rock/

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