Paint and alchemy share the same core problem: liquid becoming solid

Elkins opens with a deceptively simple observation: both oil painting and alchemy are fundamentally about the transformation of fluid substances into stable, fixed forms. Painters mix powdered pigment, essentially ground stone, with liquid mediums like linseed oil to create a substance that can be spread wet and will eventually dry into a permanent surface. Alchemists pursued an almost identical structural problem, seeking to transmute base, changeable liquids into a stable, perfected "philosopher's stone," working for centuries with sludges, tinctures, and residues that behave remarkably like wet paint on a palette.

Elkins uses this parallel not as decoration but as a genuine methodological tool, arguing that alchemy developed a far richer vocabulary for describing the intermediate, half-liquid, half-solid states that matter passes through than modern chemistry or art history ever bothered to develop, since neither discipline needed such language for its own purposes. Painting, he insists, spends most of its working life in exactly those in-between material states.

Takeaway: to understand what a painter does with paint, you need a vocabulary built for describing transformation, not just finished results.