Research Article
Characterization of Two Historical Postage Stamps Made from Cotton Fibers and Their Restoration Trials Based on the Experimental Studies
Figure 1
The stamp form. Red color and shape (a), blue color and shape (d), measurement of the stamp thickness (b, e), and the stamp watermark (c, f).
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(b) |
(c) |
(d) |
(e) |
(f) |