I found Cornelis Drebbel the way you find the best characters: in a footnote in someone else’s story.

He turns up in Amy Butler Greenfield’s A Perfect Red, which I’m reading this month, as the man behind the brilliant scarlet that made cochineal even more valuable than it already was. But the dye was only one piece of him. Drebbel was an inventor, an engraver, a chemist, a maker of improbable machines, and, apparently, a man spectacularly bad at converting genius into money.

I once attended a dinner at Jan and Warren Adelson’s home. Their New York gallery is known for its collection of American Impressionists and the work of John Singer Sargent. As I moved through the house during this charity event for the Hudson River Museum, I began to recognize paintings at a glance—Sargent and Eakins, a drawing by Ingres, a grisaille gouache by Homer, a medallion by Saint-Gaudens. Nothing was labeled. It was a home, not a museum. But the work announced itself.

Then, over a desk, there was a painting that stopped me. At first, it looked like scratches of color. After a moment, a waterfall began to resolve, but what held me was the color—a very particular Veronese green. And then it clicked: Twachtman. John Henry Twachtman. Adelson confirmed it.

I’ve always been struck by how specific an artist’s palette can be. Not just a preference for color, but something closer to identity.