Fig. 8: UV-visible chromatogram (350 nm) of the reddish-yellow sample from Aristotle with a Bust of Homer after BF₃–MeOH extraction.

Carminic acid (6), two side products related to reaction of carminic acid with BF₃-MeOH (7, 8), kaempferol (10), rhamnetin (11), rhamnocitrin (12), and emodin (13) are identified.