Fig. 5: Infrared spectra of samples.
From: Growth regulation of calcium oxalate film for surface protection of carbonate stone heritage

a BS; b AmOx; c HG1; d HG2; e HG3.
From: Growth regulation of calcium oxalate film for surface protection of carbonate stone heritage

a BS; b AmOx; c HG1; d HG2; e HG3.