Pigments were extracted from self-colored soybean seedcoats and subjected to standard procedures of paper chromatography. This research was a part of a Master's Thesis problem conducted by Barksdale Taylor on genetic and chemical evaluation of hilum variants in mature soybean seed. Brown, reddish brown and buff seedcoats did not contain anthocyanin pigments.
Taylor, Barksdale H. and Caviness, C. E.
"Research Notes: New Pigments in Soybean Seedcoats,"
Soybean Genetics Newsletter: Vol. 3
, Article 4.
Available at: http://lib.dr.iastate.edu/soybeangenetics/vol3/iss1/4