For two centuries, forty pieces of Baltic amber sat quietly in a museum collection — ordinary-looking lumps of fossilized resin, never polished, their interiors largely unexamined. They had passed through the hands of Johann Wolfgang von Goethe himself. Yet what they contained, invisible to the naked eye, had gone unnoticed by everyone who came after him.
Then a team of researchers decided to look closer.
A collection hiding in plain sight
Goethe’s 40 pieces of Baltic amber now rest in the Goethe National Museum, managed by the Klassik Stiftung Weimar. To most visitors, they look unremarkable — rough, unpolished lumps of fossilized resin. Two of those specimens, it turns out, contained fossilized animals hidden just beneath the surface, and because the pieces had never been polished, the inclusions were nearly invisible without magnification.
Researchers from the University of Jena suspected the collection deserved a second look. Rather than physically preparing the specimens — a process that risks destroying fragile material — they chose a different approach entirely.
Goethe himself, for all his intellectual range, showed limited interest in what amber might hold biologically. He was more drawn to its optical qualities, even grinding pieces of fossilized resin into lenses to study color effects for his work on color theory. The creatures locked inside were simply not his concern.
How synchrotron imaging cracked open the past
To examine the specimens properly, the research team traveled to the German Electron Synchrotron, known as DESY, in Hamburg. There, they used synchrotron micro computed tomography — a technique that generates highly detailed three-dimensional images by passing intense X-ray beams through an object. No cutting, no grinding, no chemical treatment.
For museum collections holding irreplaceable historical objects, that non-invasive quality matters enormously. Curators can permit scientific investigation without accepting the risk of permanent damage — a consideration that opens doors physical preparation would keep firmly shut.
The scans were revealing. Inside the two amber pieces, researchers identified three trapped insects: a fungus gnat, a black fly, and an ancient ant. Each had been waiting, undisturbed, for roughly 40 million years.
The ant that rewrote its own species record
The ant drew the most attention. It belongs to the extinct species †Ctenobethylus goepperti — a name already familiar to amber paleontologists, since specimens appear with some regularity in Baltic amber deposits. Familiarity, though, hadn’t meant understanding.
“The ant belongs to the extinct species †Ctenobethylus goepperti, which is very common in amber,” says Bernhard Bock from the Phyletisches Museum of the University of Jena. “Thanks to its excellent preservation and the extensive investigations, however, we were able to describe it in greater detail than ever before and gain new information about the species and its relationships.”
The scans revealed fine body hairs on the worker ant and allowed researchers to visualize internal skeletal structures inside the head and thorax — features never previously documented for this species. Seeing inside a 40-million-year-old insect without touching it is precisely the kind of result that justifies the trip to Hamburg.
A complete digital 3D reconstruction of the fossil was produced and made available online. As Daniel Tröger from the University of Jena explains, the model “helps colleagues worldwide to identify and compare further fossils of this species.” Science rarely stays local when the data can travel freely.
Clues about ancient forest life
Understanding what †Ctenobethylus goepperti looked like in detail opened a door to thinking about how it may have lived. Researchers compared the extinct species with Liometopum, a modern ant genus found today in North America and warmer parts of Europe. That comparison suggested the ancient ants likely built large nests in trees, with the behavior of their living relatives lending support to the hypothesis.
The amber record itself adds a layer of indirect evidence. Tree resin traps insects most efficiently near or on trees, so an ant species that nested in bark or branches would have encountered resin constantly — making preservation far more probable than for ground-dwelling species. The frequency of †Ctenobethylus goepperti in amber deposits may not be coincidental. It may simply reflect where these ants spent their lives.
Why old collections still matter
The Goethe amber study is a reminder that historical museum collections aren’t static archives. They’re reservoirs of unanswered questions, waiting for the right tools to arrive.
Bock put it plainly: “Goethe is regarded as the founder of morphology and would likely have been delighted to see how we were able to gain valuable insights in this field using entirely new methods.” The irony holds — the man who pioneered the study of biological form owned a specimen that would have fascinated him, and never knew it.
Museums worldwide hold collections assembled long before synchrotron imaging, micro-CT scanning, or digital reconstruction existed. Many of those objects have been catalogued, shelved, and largely set aside. How many contain something equally unexpected?
The 3D model now available online points toward one answer. Digitization doesn’t replace physical collections — but it extends their reach across institutions and generations, giving future researchers tools that don’t yet exist. Whatever Goethe’s amber still has to say, it’s no longer saying it only to the people in the room.