Effect of Some Deacidification Agents on Copper-Catalyzed Degradation of Paper

Table 2

Table 2. Effect of Deacidification Treatments on Brightness (% of Blue Refectance)
of Samples Aged at 90° and 50% RH

Days Aged	Control water washed treatment	Copper sorption only treatment	Copper and calcium 2-step treatment	Copper and Mg(HCO₃)₂ immersion treatment	Copper and Mg(HCO₃)₂ spray treatment	Copper and Zn(HCO₃)₂ spray treatment
0	89.60	87.73	86.75	88.37	86.95	87.67
2	----	74.68	75.75	77.83	74.28	79.43
5	85.52	68.15	73.33	73.58	65.03	69.43
8	81.90	64.50	66.13	69.25	58.08	62.95
12	81.58	56.25	----	66.13	----	----
13	----	----	59.90	----	48.73	47.48