Alfonso Espinosa, Cesar De La Rosa
Laboratorio de Restauración Digital of the Cineteca Nacional of Mexico City (Mexico)
One of the biggest problems in nitrate film deterioration is the developing of a thick oxide surface over the reel (known as sulphating), that happen during the critical stages (four and five) of degradation which inhibits any kind of conservation treatment.
Throughout the years, the efforts to reverse nitrate celluloid later stages have not been successful at all, however the stabilization of this sort of deterioration could be considered thanks to a new chemical method; neutralization of sulphating in nitrate celluloid, developed in the Laboratorio de Restauración Digital of the Cineteca Nacional in Mexico City. With this process it will be possible to remove waste resulting from degradation and give restorers an opportunity to handle the film properly on a working table. Once neutralized the sulphating and after physical reconstruction of the film, it is necessary to pass it through a digital workflow, as image or sound scanning and further digital restoration. This method is a good chance to rescue film materials from trash of archives around the world, to consider them as candidates to conservation, preservation and restoration once more.
A test was run in a 35 mm nitrate negative in B/W of “Pasaporte a Río” (Dir. Daniel Tinayre, 1948) which presented an extremely advanced degradation stage. The process recovered almost 70% of the film, which is remarkable for its critical state of degradation. Then the material were passed through a digital workflow achieving great results.
Cesar De La Rosa Anaya
September 2012-. Laboratorio de Restauración Digital of the Cineteca Nacional of Mexico City
- Specialist Technical of the ARRISCAN equipment for scanning films formats in 35 mm y 16 mm.
2006-2012. Universidad Autónoma de la Ciudad de México (UACM). Degree with honors in: “Communication and Culture”.
Alfonso Espinosa Rosas
January 2013 – at present. Cineteca Nacional. Chemical specialist in digital film Lab of digital restoration processes
- Responsible for processes of cleaning and stabilization of film material.
- Responsible for carrying out security, research and innovation for the restoration laboratory protocols.