Wall of text here from Wikipedia. Someone was experiencing the last paragraph on some of their decks. This wall is in reference to film, but it could be the same thing going on here since it’s a similar if not same material.
From Wikipedia
Cellulose acetate releases acetic acid, the key ingredient in vinegar, which is responsible for its acidic smell. The problem became known as "vinegar syndrome".[3] This accelerates degradation within the film, and can also contribute to damage to surrounding films and metals.[4]
The first instance of cellulose triacetate degradation was reported to the Eastman Kodak Company within a decade of its introduction in 1948. The first report came from the Government of India, whose film materials were stored in hot, humid conditions. It was followed by further reports of degradation from collections stored in similar conditions. These observations resulted in continuing studies in the Kodak laboratories during the 1960s. Film degradation can only be delayed by storage in dry and cold conditions. It was initially thought that storage under recommended conditions might delay decay by 450 years, but some films are developing vinegar syndrome after just 70 years of cold dry storage.[5] Arri and others sold film recorders specifically for recording video onto film for archival purposes based on the assumption that vinegar syndrome could be delayed for long periods of time.[6][7]
The progression of degradation
Edit
In acetate film, acetyl (CH3CO) groups are attached to long molecular chains of cellulose. With exposure to moisture, heat, or acids, these acetyl groups break from their molecular bonds and acetic acid is released.[8] While the acid is initially released inside the plastic, it gradually diffuses to the surface, causing a characteristic vinegary smell.
The decay process follows this pattern:
Acetic acid is released during the initial acetate base deterioration, leading to the characteristic vinegar odor. This signal marks the progression of deterioration.[9]
The plastic film base becomes brittle. This occurs in the advanced stages of deterioration, weakening the film and causing it to shatter with the slightest tension. These physical changes happen because cellulose acetate consists of long chains of repeating units, or polymers. When the acetic acid is released as these groups break off, the acidic environment helps to break the links between units, shortening the polymer chains and leading to brittleness.[9]
Shrinkage also occurs during this process. With the cellulose acetate polymer chains breaking into smaller pieces, and with their side groups splitting off, the plastic film begins to shrink. In advanced stages of deterioration, shrinkage can be as much as 10%. There have been some reports of film 35mm wide shrinking to almost 17mm.[9]
As the acetate base shrinks, the gelatin emulsion of the film does not shrink, because it is not undergoing deterioration. The emulsion and film base separate, causing buckling, referred to by archivists as 'channelling.'[9] Sheet films are often severely channelled in the later stages of degradation.
Crystalline deposits or liquid-filled bubbles appear on the emulsion. These are evidence of plasticizers, additives to the plastic base, becoming incompatible with the film base and oozing out on the surface. This discharge of plasticizers is a sign of advanced degradation.[10]
In some cases, pink or blue colors appear in some sheet films. This is caused by antihalation dyes, which are normally colorless and incorporated into the gelatin layer. When acetic acid is formed during deterioration, the acidic environment causes the dyes to return to their original pink or blue color.[10]