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The photographic glass plates are stored vertically on the long side of the plate in storage boxes whose material is free of acid, lignin, polyvinyl chloride (PVC), dye, sulfur, and alum. The acidity of any paper storage used should show a pH between 7 and 8.5. [26] Glass plates should not be packed tightly and should not rub against each other.
Collodion printing was typically done on albumen paper. As collodion is a sticky and transparent medium and can be soaked in a solution of silver nitrate while wet, it is ideal for coating stable surfaces such as glass or metal for photography. When a metal plate is coated with collodion, charged with silver nitrate, exposed, and developed, it ...
Modern prints onto paper protected from the sun and moisture will last an incredibly long time. Prints made using newer alkaline and acid-free paper have a life expectancy of over 1,000 years for the best paper and 500 years for average grades. When it comes to older prints, the condition of a print largely depends on the technique used to make ...
The plate's ground side is then dipped into acid, or the acid poured onto it. The acid bites into the surface of the plate where it was exposed. Biting is a printmaking term to describe the acid's etching, or incising, of the image; its duration depends on the acid strength, metal's reactivity, temperature, air pressure and the depth desired. [8]
Glass plates were far superior to film for research-quality imaging because they were stable and less likely to bend or distort, especially in large-format frames for wide-field imaging. Early plates used the wet collodion process. The wet plate process was replaced late in the 19th century by gelatin dry plates.
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