Panel painters in both the middle ages and the fifteenth century created works that evoke the luster of precious stones, the sheen of polished gold and silver, and the colorful radiance of stained glass. Yet their approaches to rendering these materials were markedly different. In The Varnish and the Glaze: Painting Splendor with Oil, 1100–1500 (U Chicago Press, 2023), Dr. Marjolijn Bol explores some of the reasons behind this radical transformation by telling the history of the two oil painting techniques used to depict everything that glistens and glows—varnish and glaze.

For more than a century after his death, the fifteenth-century painter Jan van Eyck was widely credited with inventing varnish and oil paint, on account of his unique visual realism. Once this was revealed to be a myth, the verisimilitude of his work was attributed instead to a new translucent painting technique: the glaze. Today, most theories about how Van Eyck achieved this realism revolve around the idea that he was the first to discover or refine the glazing technique. Bol, however, argues that, rather than being a fifteenth-century refinement, varnishing and glazing began centuries before. Drawing from an extensive body of recipes, Dr. Bol pieces together how varnishes and glazes were first developed as part of the medieval art of material mimesis. Artisans embellished metalwork and wood with varnishes and glazes to imitate gold and gems; infused rock crystal with oil, resin, and colorants to imitate more precious minerals; and oiled parchment to transform it into the appearance of green glass. Likewise, medieval panel painters used varnishes and glazes to create the look of enamel, silk, and more.

The explorations of materials and their optical properties by these artists stimulated natural philosophers to come up with theories about transparent and translucent materials produced by the earth. Natural historians, influenced by medieval artists’ understanding of refraction and reflection, developed theories about gems, their creation, and their optical qualities.

This interview was conducted by Dr. Miranda Melcher whose book focuses on post-conflict military integration, understanding treaty negotiation and implementation in civil war contexts, with qualitative analysis of the Angolan and Mozambican civil wars. You can find Miranda’s interviews on New Books with Miranda Melcher, wherever you get your podcasts.

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In my conversation with Professor Pablo F. Gómez about his new book, Bloody Numbers: The Early Atlantic Slave Trade and the Invention of Modern Corporeality, published by the University of Chicago Press in 2026.

Our conversation explored the unsettling relationship between slavery, the body, measurement, and knowledge. What does it mean to measure a human body within a system that has already reduced that person to a commodity? And what happens when numbers that appear neutral become entangled with violence, commerce and exploitation?

What stayed with me is the book’s invitation to think differently about numbers. Behind measurements of height, weight, health, disease and mortality were human beings whose lives could not be contained by the data recorded about them.

These questions are not only historical. We live in an increasingly quantified world, where bodies, health, productivity and risk are constantly measured and transformed into data.

So perhaps one question we should keep asking is: Who is doing the counting, why are they counting, and what happens to the people being counted?

I invite you to listen to our conversation and reflect with us on the histories behind the numbers we encounter today.

Amisah Bakuri (PhD) is an Assistant Professor in the Faculty of Social Sciences and Humanities at Vrije Universiteit Amsterdam. Her work explores the intersections of religion, sexuality, gender, and migration, especially within African diasporic communities in the Netherlands.

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Standardizing Sex: A History of Trans Medicine (U Chicago Press, 2025) traces the emergence of trans medicine in Scandinavia in the twentieth century, exploring the construction and negotiation of medical expertise among medical professionals, patients, and activists in the media and government bureaucracy. The book combines the author’s analysis of medical records and other archival sources with oral history interviews with former patients, activists, doctors, psychologists, and civil servants. Physician-historian Ketil Slagstad uses the Scandinavian story of sex reassignment to anchor not only the role of the state but also bureaucracy and social rights. Scandinavian countries, he shows, played a foundational role in the emergence of trans medicine internationally. As a result, Standardizing Sex tells a transnational history of medicine that sheds light on a set of relations and problems that continue to impact discussions of trans medicine and trans rights around the world.
Slagstad’s sources offer a rare opportunity to explore the emergence of trans medicine in action in the clinic, laboratory, waiting room, and operating room, as well as in the bureaucrat’s office, on the psychologist’s couch, and in the publications and meetings of activist groups. Together, these sources allow for the analysis of the increasingly complex negotiations of nosological criteria, medical knowledge, and medical practices in a formative period for transgender medicine. More generally, the book offers a story about the reshaping of the normal and the pathological in modern societies.

Ketil Slagstad is a research fellow at the Institute for the History of Medicine and Ethics in Medicine at Charité: Universitätsmedizin Berlin.

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