Characterization of Two Historical Postage Stamps Made from Cotton Fibers and Their Restoration Trials Based on the Experimental Studies

Figure 10

The shape of the blue stamp fiber paper, which shows that it is made of cotton pulp at a magnification of 500X (a). Printing ink granules with cracking in the color layer and growth of fungi at 500X magnification (b). (c) Amount of stamp fibers frayed using SEM (12000X magnification). The effect of fungal growth on the erosion of the fibers of the stamp paper (12000X magnification) (d).

(a)

(b)

(c)

(d)