Fig. 5: Infrared spectral results of samples.
a modern birch bark (Betula utilis), b XZDL-1, c XZDL-2, d ink area of XZDL-1, e ink area of XZDL-2.
Fig. 5: Infrared spectral results of samples. | npj Heritage Science
a modern birch bark (Betula utilis), b XZDL-1, c XZDL-2, d ink area of XZDL-1, e ink area of XZDL-2.
