Moroccan manuscript paper (Sample F)

Ingredients

cellulose, calcium carbonate, Kaolin, barium sulfate, zinc oxide

Preparation Steps

Original Recipe Text

Standard restoration involving Ca(OH)2 solution. Trace element analysis by EDXRF identified Zinc (Zn) in this 18th-century paper, possibly originating from processing water or white zinc oxide fillers (Section 3.3, p. 654).

Evidence

"with reference to aged sample F, no explained tendency is observed regarding the diffraction peaks evolution with aging (Fig. 4b), but its crystallinity surprisingly increased ever since the third day of treatment."

Remarks

Sample F showed an unusual behavior where its crystallinity index increased during the initial stages of aging before finally decreasing after 28 days (Table 3). This is attributed to the initial degradation of amorphous regions of cellulose, which effectively increases the relative percentage of crystalline regions (Section 3.2, p. 651).