Of all of the yeast strains examined in Fig. 2, only the WLP715 champagne strain displayed better growth kinetics in low pH/high [lactic acid] media than CBC-1 (Fig. 2F). Though subtle in the context of growth curves, perhaps this more robust growth would make WLP715 a better choice for bottle conditioning. Indeed, as shown in Table 1,WLP715 is a hardy strain known for its high levels of attenuation and alcohol tolerance. Therefore, we tested its ability to carbonate Cauldron by inoculating the beer with 2 106 cells/mL WLP715 and incubating as described above. However, upon uncapping the bottles, no carbonation was evident (Fig. 3B), and further incubation for an additional 2 weeks had no effect