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Cyanotype
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=== Long-term preservation === One of the most robust of Victorian print technologies, cyanotypes are quite stable on their own, but in contrast to most historical and present-day processes, the prints do not react well to [[base (chemistry)|basic]] environments.<ref>{{Cite book|url=https://books.google.com/books?id=Kd5cAgAAQBAJ&q=cyanotype+prints+do+not+react+well+to+basic+environments&pg=PA361|title=Encyclopedia of Nineteenth-Century Photography|last=Hannavy|first=John|date=2013-12-16|publisher=Routledge|isbn=978-1-135-87327-1|language=en}}</ref> As a result, it is not advised to store or present the print in chemically buffered [[museum board]], as this makes the image fade. Another unusual characteristic of the cyanotype is its regenerative behavior: prints that have faded due to prolonged exposure to light can often be significantly restored to their original tone by simply temporarily storing them in a dark environment.<ref>{{Cite journal |last=Ware |first=Mike |date=1999 |title=Cyanotypes: their history, chemistry, and conservation |url=https://www.worldcat.org/oclc/610989224 |journal=Care of Photographic Moving Image & Sound Collections |language=en|pages=115β123 |oclc=610989224}}</ref><ref>{{Cite journal |last=Aloi |first=Giovanni |date=2021 |title=Unearthed: Photography's Roots |journal=Antennae: The Journal of Nature in Visual Culture |volume=53 |pages=66β77}}</ref> Cyanotypes on cloth are permanent but must be washed by hand with non-phosphate soap<ref>{{cite web |url=http://www.blueprintsonfabric.com/instructions.php |publisher=blueprintsonfabric.com |title=Washing instructions for cloth}}</ref> so as to not turn the blue to yellow.
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