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Video Transcription

This work is focused on the correlation of the visual assessment of cellulose nitrate films

and the molecular assessment of the same supports.

So we want to understand if there is a clear correlation of the visual signs of what we see in the surface of the films

and what we see is happening in the film support.

So when we are thinking about cellulose nitrate, we think about a material that is highly flammable

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with a characteristic chemical instability that results in the rise of the acidity and the decay of the film support.

Basically we can see that the film becomes brittle and sticky.

But it also occurs the degradation of the gelatin due to the oxidative action of the nitrate acid

that is produced during the degradation process.

This is not a catalytic and irreversible process.

However, we have some opposite situations where we can find cellulose nitrate, good as new,

with no signs of degradation, with flexibility, transparency and dimensional stability.

Taking these aspects into consideration, we find it intriguing why some film supports are good as new

while others decay severely.

Is it because of the type of composition or the film format

or because of the past enclosures?

Maybe because of some interventions made by the photographers like this type of masks?

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