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Figure 5 | Heritage Science

Figure 5

From: Investigation of the stabilization of verdigris-containing rag paper by wet chemical treatments

Figure 5

Ca mapping on the surface of calcium hydrogen carbonate-treated samples. Left – Sample after calcium hydrogen carbonate treatment in pure water. The Ca signal was close to the background noise. Right – Sample after calcium hydrogen carbonate treatment in a mixture of water and ethanol (2:1). The overall Ca signal was still weak but relatively higher, and accumulated Ca compounds were observed.

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