It is the dread of many film collectors. The tiniest hint of that acrid smell that can only be attributed to vinegar hits them as they enter their film room or as they are perusing through their collection. With so much time, money, and love involved in the gathering of these films people will do almost anything to try to prevent and protect their heart felt films. The first step would be to truly understand vinegar syndrome http://www.mdepot.com/vinegar-syndrome.html and the adverse effects it has on microfilm and microfiche.
Early microfilm and microfiche were made of cellulose acetate which, over time, actually break down or decompose into acetic acid. This acid is what actually causes the vinegar smell. The first instance of this was noted way back in 1948 which was within a decade of its introduction into use.
The long molecular chains of cellulose are attached to the acetyl in the films. Over time and exposure to heat, moisture and acids this acetyl breaks away from the cellulose bonds and then the acetic acid develops. There is a distinct pattern and it almost aways follows it.
When the acetyl initially begins to deteriorate the acetic acid is released which results in the vinegar smell. Then the plastic base that the film uses becomes brittle. This happens in stages and progressively worsens as time goes on. Finally it gets to a point where the slightest tension or bend will cause the film to tear and or rip.
