Highlights importance of knowing preserve photographic archives
Decades of history chart may end up in an instant if the files containing photographic materials made from nitrocellulose media do not receive proper treatment.
Such was the case containing the body of the former National Cineteca located behind Churubusco Studios, whose incident occurred on March 24, 1982, and that has not yet been fully clarified, ended seven decades of film history of the country.
In order to avoid accidents like this specialist Juan Carlos Valdes Marin published the manual "How I take care of my photographic negatives", first volume of the Journal of the National Photobank, announced in a statement the National Institute of Anthropology and History (INAH).
The publication, which is part of the nine volumes published in the Journal of the National Photobank, concerns that the nitrocellulose is a highly flammable material. "Indeed, the photographic material is more chemically unstable in all there soon."
Remember that the photographic industry began using nitrocellulose film, which is an ester of cellulose treated with nitric acid to produce cellulose nitrate. It was not until the 1950s when he began to replace this material by the so-called safety film.
In photography, visual part of the backups that are kept are made of this material, and should be preserved as described in special conditions for security reasons.
It states that over time, nitrogen dissociates and equipment as well as causing degradation of the film, a highly flammable material, the more susceptible to damage and even total destruction.
To clean the negatives made with nitrocellulose, Valdes Marin recommended on an auxiliary rigid cardboard or acrylic base, using white cotton gloves when handling the pieces and never on glass or any abrasive surface.
As a next step, with a fine hair brush should be soft and remove all dust particles from the center toward the margins of the negative, then, with clinical use of cotton with a solution of ethyl alcohol and distilled water or a commercial cleaning solution be clean in one direction.
The current head of the National Photobank clarified that this publication is for the negatives on silver gelatin glass plate known as dry as the nitrocellulose not showing degradation of the medium, as well as in film security.
Clarifies that after cleaning the photographic negatives, must be kept neutral and features guards kept in an environment suitable for their shelter, with temperatures between 18 and 22 degrees centigrade and a relative humidity between 48 and 52 per cent.
INAH stressed that the booklet also contains tips on how to eliminate the negative fungi, where and how to save, what parts are a negative, how to qualify and determine the damage suffered, and many recommendations.
He stressed that to date have been published nine volumes of the Journal of the National Photo, the most recent entitled "disappeared and presences. Recovery of negative, "Marie-Antoinette Roldán Arellano.
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