Unstable Materials

The Problem Is Built In

Many artists working from the mid-twentieth century onward chose materials not from ignorance but from conviction. Latex rubber, polyurethane foam, cheap plastic sheeting, unstretched raw canvas coated in house paint — these were deliberate rejections of the oil-on-linen tradition, with its assumption that a painting should survive centuries. The materials were cheap, immediate and carried no academic weight. That was the point.

The difficulty arrives later, in the museum's storeroom. Latex yellows, cracks and becomes brittle. Flexible foam oxidizes, turning from soft to powder. Polystyrene offgasses acids that attack neighboring works. Unlike linseed oil, which cross-links into a stable film over decades, most synthetic polymers from the 1960s are in active chemical decline. Conservators have known this for years, but knowing the mechanism does not stop it.

What makes the situation unusual is that no straightforward repair ethic applies. The old rule — restore a surface to what it looked like, and document every intervention — assumes the artist wanted the work to persist. Some did. Others were genuinely indifferent. A few were interested in time itself as a medium, in the slow change from one state to another. Replacing a deteriorated foam core with fresh material produces an object that looks right and is, in a meaningful sense, wrong.

The question that conservation then has to answer is not chemical but intentional: what did the artist mean by this choice? Interview archives, studio notes and correspondence have become as central to a restorer's practice as the pH meter. Where documentation exists, it can authorize replacement — or prohibit it. Where it does not, the institution has to decide whose interpretation stands.

Some works have effectively been allowed to die: held in storage, displayed rarely if ever, too fragile to travel. Others have been remade wholesale, with the remake shown as the work while the original, such as it is, sits elsewhere. Neither solution is entirely satisfying. Both are honest, in their way, about what these materials were always going to do.

The conservator's dilemma here is less about chemistry than about what the claim was in the first place — what the artist asserted the work to be, and whether a replacement object can carry that assertion forward.