A scientific paper experimenting with garlic pigments, to be found here:
http://onlinelibrary.wiley.com/doi/1...8.00986.x/full
From the abstract:
"The color-forming ability of amino acids with thiosulfinate in crushed garlic was investigated. We developed reaction systems for generating pure blue pigments using extracted thiosulfinate from crushed garlic and onion and all 22 amino acids. Each amino acid was reacted with thiosulfinate solution and was then incubated at 60 °C for 3 h to generate pigments."
"..Our findings indicated that green discoloration is created by the combination of yellow and blue pigments. Eight naturally occurring blue pigments were separated from discolored garlic extracts.."
Here is the table of colors produced by these experiments, which you can read in full at the link above, and the corresponding amino acids... amazing!!!
