FIGURE 1: Laboratory scale dry biocleaning on two specimens. (Top) sample 1 (A –B), a common flat stone (carbonate stone) before and after yeast-sucrose addition; (middle) sample 2 (C-D), a CH marble fragment, after yeast-sucrose addition and detail of incubation in the Gas-Pak jar with condensation phenomenon; (bottom) sample 2 (E-F), the CH marble surface before and after the dry biocleaning process.