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

Figure 7

EDX analysis of stamp surface (front and back sides). Measurement of two spots from the stamp front side ((a, b) from red stamp, (d, e) from blue stamp) and one spot from the back side ((c) from red stamp; (f) from blue stamp).

(a)

(b)

(c)

(d)

(e)

(f)