Research Article
Newly Developed Nano-Calcium Carbonate and Nano-Calcium Propanoate for the Deacidification of Library and Archival Materials
Figure 5
Raman spectra collected with excitation line λ = 785 nm. (a) Laboratory paper after the treatment with nano-calcium carbonate. The peaks related to the calcium compound, after treatment, are evidenced by comparison with a standard calcite spectrum. (b) Laboratory iron-gall ink before and after treatment with calcium propanoate. All the typical peaks of the ink (around 576 cm−1: band related to the formation of iron-cellulose complex; 1431 cm−1: COO− sym. stretching, C–H and O–H bending; 1486 cm−1: CH2 scissoring, C=C ring semicircle stretching, C–H bending; 1596 cm−1: C=C ring quadrant stretching [25, 26]) remained unaltered after the treatment.
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