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<p>[QUOTE=&quot;krispy, post: 761336, member: 19065&quot;]I do not (yet) have this book but I suspect from your photos that each illustration in this book is its own &#039;plate&#039; without any printing/text on the back side. I&#039;m want to say that the &#039;ghosting&#039; of the graph on the back of the previous illustration may have occurred prior to binding and prior to the ink fully drying, yet having spent enough time in contact (perhaps stacked together in the order the illustrations were inserted into the signatures) to have transferred acidic agents from the ink used to print the chart to the back of the earlier illustration. This may have been something unnoticed over the years but which very slowly appeared. </p><p><br /></p><p>The color may appear reddish due to the properties of the black used to print the chart, the reaction between the ink/paper, or just the paper itself if acidic. Again, I don&#039;t have this book to inspect and touch the pages to tell, but the paper of the plates may be one stock (of a better quality for taking the illustration) while the text pages may have been a &#039;cheaper&#039; grade paper (better for printing type) yet containing acids from the paper pulp. An acidic paper can leach out to other &#039;better&#039; papers and react differently around the illustration(s), &#039;outlining&#039; an offset or mirror ghost-image of that design. </p><p><br /></p><p>Those are my immediate thoughts based on seeing such things in other antique books and also <u>not</u> holding <i>this</i> book to inspect it for such effects of conditional aging. When I break down and buy a copy I will check it out for the same thing. Let me know what you think of the ideas I expressed, yea/nay?[/QUOTE]</p><p><br /></p>

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