Figure 6
From: Investigation of the stabilization of verdigris-containing rag paper by wet chemical treatments
Stability of calcium hydrogen carbonate in solution. Calcium hydrogen carbonate in pure water (left vial) and in mixture of water and ethanol (2:1) (right vial) after exposure at ambient conditions for 3Â hours. Precipitation of the calcium carbonate at the bottom of the vial is clearly visible in the mixture.