In copperplates, grooves in the metal became thinner as the surface was eroded, resulting in thinner lines in prints.The surface erosion appears to have been from the routine polishing of the plates that occurred before each print run, to remove nicks and corrosion.
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The dating question comes up often in historical picture collections.
It’s not always easy to answer, because the people who made or collected the picture often didn’t leave much written information.
When he's not writing here, he can be found doing freelance social media, graphic design and marketing consultation, or asking for coffee refills at brunch.
The photo shows the busy catalog card distribution office at the Library of Congress. Recently, we needed to determine when the photo was taken, so out came my magnifying glass.
It is based on the hypothesis, backed by observations, that woodblocks and metal plates (e.g., copperplates) deteriorated in a clock-like manner during their lifespan, which was often decades.
In woodblocks, the deterioration occurred mainly with aging and random cracking of the wood, resulting in line breaks in the prints.It is described elsewhere in two technical publications (Hedges, S.B, 2006, 2008a) and one review article (Hedges, 2008b).The typewriters and the women’s clothing suggest the early 1900s.I looked in vain for calendars on the walls or desks that might have pinned down the date further.During the years 1943-1947 his seal was sometimes placed on Hasui prints instead of the usual "publisher seal." Prints published in the period 1932 - 1945 bear one of the typical "oblong" Watanabe seals on their margins. We do not know whether the complete range of seals D to G got used for Kasamatsu's prints, however, any of his prints of the period 1932 - 1945 with such a seal can be considered a first or very early editions.