Research Article
Newly Developed Nano-Calcium Carbonate and Nano-Calcium Propanoate for the Deacidification of Library and Archival Materials
Table 2
Treatments of laboratory paper samples with calcium propanoate in ethanol.
| pH before treatment | pH after treatment |
| Control paper: 5.4 ± 0.1 | Control paper: 8.9 ± 0.1 | Acidic paper: 4.9 ± 0.1 | Acidic paper: 8.3 ± 0.1 |
| Colour coordinates before treatment | Colour coordinates after treatment |
| Control paper: | Control paper: | L = 97.15 ± 0.10 | L = 97.01 ± 0.08 | a = −0.42 ± 0.03 | a = −0.48 ± 0.02 | b = +0.68 ± 0.06 | b = +0.69 ± 0.05 | Acidic paper: | Acidic paper: | L = 96.31 ± 0.11 | L = 96.31 ± 0.11 | a = −0.80 ± 0.03 | a = −0.77 ± 0.03 | b = +2.11 ± 0.09 | b = +1.98 ± 0.07 |
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