Hola.
Hoy os enlazo nuevamente un poco de teoría de la buena.
En este caso os muestro un interesante artículo donde su autor resume el procedimiento que sigue para obtener una "copia con calidad de archivo".
Archival Processing of Prints
by Ed Buffaloe
Silver halides are the most sensitive materials available for use in photographic emulsions, but unfortunately metallic silver oxidizes very readily, so that silver images formed in our photographic negatives and prints require protection or stabilization in some way. Archival processing involves fixing film and paper adequately to remove unexposed silver halides, washing appropriately to remove excess fixer, and preferably treatment with some sort of toning or sequestering solution to prevent the emulsion silver from oxidising in the presence of various environmental pollutants. In this article, I am primarily concerned with photographic prints rather than negatives.
Fixing: Adequate fixing is necessary to remove unexposed silver halides, which, if left in place, would react with light and degrade the image. Most practitioners today use Ilford’s processing method for prints, which specifies rapid fix (with ammonium thiosulfate instead of sodium thiosulfate) at “film” strength, i.e., diluted 1:3 or 1:4 instead of the old “paper” dilution of 1:7, for about one minute (compared to the 5 to 10 minutes required in a sodium thiosulfate fix)...
Fixing: Adequate fixing is necessary to remove unexposed silver halides, which, if left in place, would react with light and degrade the image. Most practitioners today use Ilford’s processing method for prints, which specifies rapid fix (with ammonium thiosulfate instead of sodium thiosulfate) at “film” strength, i.e., diluted 1:3 or 1:4 instead of the old “paper” dilution of 1:7, for about one minute (compared to the 5 to 10 minutes required in a sodium thiosulfate fix)...
Saludos
Javier Mejías
