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[–] UffishThought [S] ago 

The color for the black bun seems to be achieved using a combination of Caramel Color, Red #40, Yellow #6, and Blue #1. According to Wikipedia, 95% of ingested Brilliant Blue dye can be found in the feces. As to why it comes out green rather than blue, perhaps when combined with bile it changes color? Lol, not sure...