How to Store and Preserve Animation Cels

Why preservation matters

Every authentic animation cel is painted on cellulose acetate—a material that naturally deteriorates over time. Without proper care, colours fade, paint flakes, and the plastic releases acetic acid, known as “vinegar syndrome.” This guide outlines how to store, display, and protect cels so they last for decades without losing integrity or value.

1. Control temperature and humidity

Acetate decays fastest in warm, humid air.

• Keep storage between 15–20°C (59–68°F) and 40–50% relative humidity.
  

• Avoid basements, attics, or sealed boxes where heat and moisture build up.
  

• Use silica gel or molecular-sieve packets inside drawers or cabinets to stabilise humidity.
  

Even small environmental improvements can multiply lifespan—tests by the Image Permanence Institute show that lowering storage temperature by 5°C can double acetate longevity.

2. Choose archival materials

• Store each cel in acid-free, lignin-free paper folders or polyester (Mylar) sleeves.
  

• Never use PVC plastics or standard polypropylene sheets; they off-gas and accelerate decay.
  

• Insert acid-free boards behind each cel for support.
  

If you stack multiple layers, separate them with unbuffered tissue to prevent sticking.

3. Flat, dark, and stable

Keep cels flat—never rolled. Warping can cause paint to crack or detach.

Store in horizontal drawers or flat archival boxes away from sunlight.

Light—especially UV—bleaches pigment quickly; 100 hours of direct daylight can cause visible loss of saturation.

4. Displaying safely

If you want to frame a cel:

• Use UV-filtering acrylic instead of glass.
  

• Include an air gap between the surface and the artwork to avoid adhesion.
  

• Hang in low-light areas, away from windows or heating vents.
  

Rotate framed works every few months to limit exposure.

5. Watch for vinegar syndrome

Early signs:

• A sour or vinegar-like odour
  

• Curling or waviness along edges
  

• Tiny crystalline droplets on the surface
  

Once started, the reaction can’t be stopped—only slowed. Isolate affected pieces in ventilated storage and contact a paper-film conservator for treatment advice.

6. Documentation as preservation

Photograph both sides of each cel under neutral light and record dimensions, scene codes, and purchase details. A documented collection is easier to insure, authenticate, and conserve.

The ORIOGI standard

All pieces entering the ORIOGI registry are stored flat in Mylar sleeves with acid-free backing, under monitored humidity and UV control. Each COA record includes environmental guidelines so collectors can match museum-grade conditions at home.