Cel Nexus

Why I’m Here

I’m a systems engineer who fell in love with animation cels, and along the way I noticed a blind spot. The guidance collectors were following had been adopted from traditional art — paper, canvas, works on board — and applied to cels as though the materials behaved the same way. They don’t. Cellulose acetate has its own chemistry and its own mechanics, and generic archival advice was never tuned to either.

I bought a cel, followed the advice available at the time, and watched vinegar syndrome set in within months. That sent me looking for why, and the question kept opening up: not just what to store a cel in, but what state it was already in when it arrived, how acid actually moves away from the material, and what rate any of it happens at.

My background is pressure systems and hazard analysis — work where you are expected to state your assumptions, define where your analysis stops being valid, and show the math. That habit is the whole reason this project looks the way it does.

What Makes Cels Different

A cel generates its own acid. That single fact separates it from almost everything else a collector owns.

In production, cellulose was put through an acetylation process: acetyl groups were substituted onto the cellulose backbone in place of its hydroxyl groups. That substitution is what made the material usable as animation stock — optically clear instead of fibrous and opaque, flexible enough to cast into thin sheet, dimensionally stable enough to register on pegs, and far less thirsty for water than raw cellulose.

Over time that process runs backwards. Moisture hydrolyses the acetyl groups off the backbone one at a time, and each one that leaves is released as a molecule of acetic acid — the vinegar smell. The material is slowly returning toward the cellulose it started as: more hydrophilic, shrinking, growing brittle, losing clarity. And because the acid it sheds catalyses the same reaction that produced it, the process accelerates as it goes.

Cels are mechanically unusual too. Paint sits on one face, the acetate moves with humidity and temperature, and the two layers do not move together. Generic archival guidance misses both halves of this, which is how well-intentioned storage ends up doing harm.

How I Work

Kinetics first. Arrhenius rate modeling with a moisture term, mass-transport analysis for how acid actually leaves a cel, and stress testing to find where a design fails rather than where it succeeds.

Then I publish the limits. Every tool and product here carries a stated design basis, a tested margin, and an explicit boundary where it stops applying. A preservation claim without a domain of validity isn’t an engineering claim, so the boundaries are stated rather than buried.

What I Won’t Claim

No enclosure stops deterioration. Nothing here reverses damage that has already happened, and no product on this site will make a degrading cel safe. Scavengers saturate, buffers exhaust, and every cel eventually leaves the envelope any given design was built for — which is why service intervals exist and why the limits are published.

What good engineering can do is change the rate. Preservation of animation cels is rate management.

The Mission

I’m not here to do what has always been done. I’m here to tune preservation to the material’s actual behavior — chemistry first, engineering always — so collectors can extend the viewable life of work that cannot be replaced, and know why it works.