| Abstract: | CONCLUSION. 1. Results obtained for the tested newsprint samples showed that their degradation could be efficiently slowed down by deacidification. The effect was more pronounced for originals which were initially less degraded (samples from 1990-2000). 2. No significant differences were observed between the results involving magnesium and calcium treatments (compare with [5]). 3. Papers deacidified with the magnesium bicarbonate solution showed the smallest drop in surface pH after aging. 4. ASTM/1SR method of accelerated aging, which requires a simple apparatus and less time, has given very similar results as the standard climatic chamber tests. 5. Although the strengthening effect was not observed for nonaged samples treated in the Neschen C-900, the degradation of these newsprint papers after aging tests was retarded similarly to much more cosily and labor-intensive laboratory methods. |
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