From left to right the samples are from the keg, from the barrel, and the initial yeast and cellular sludge that shot out from the bottom of the keg.
I had removed a gallon of wine from the barrel to sample and drink over christmas. My uncle Stuart remarked that it "was bright", with a rise of the eyebrows. It did have some harsh candy flavors as a result of the huge tartaric addition. In that operation I poured 1 pound tartaric for 60 gallons of wine!