| http://www.w3.org/ns/prov#value | - The reason why the information of the marking area can be read even when the marking area is hidden by the coloring ink, is that between the marking area and other area both beneath the coloring ink film there is difference in reflectance for infrared rays of 2-10 ??m wavelength (generally, the other area gives a higher reflectance for said infrared rays than the marking area).
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