Bizarre Ways Romans Used Urine In Daily Life

The ancient Romans were nothing if not inventive, especially when it came to reusing every possible resource at their disposal, and that included human urine. While the idea might make modern readers recoil, to the Romans, urine wasn’t waste. It was a surprisingly useful, multipurpose tool that played a role in everything from cleaning and agriculture to medicine and even taxation. The widespread use of urine might be one of the most bizarre aspects of daily life in ancient Rome, but it also speaks volumes about their ingenuity, practicality, and utter lack of squeamishness.

These are some of the strangest ways Romans used urine, and how some of those uses weren’t quite as mad as they sound.

Laundry detergent for the working class

It sounds absurd, but urine was the go-to cleaning solution in Roman laundries, particularly in places called fullonicae, which were essentially early laundromats. The key was ammonia, which naturally forms in urine and acts as a powerful cleaning agent. It helped break down grease, sweat, and dirt embedded in clothing fibres.

Laundry workers, known as fullones, would fill large vats with stale urine diluted with water. They would then place soiled garments into the mixture and stomp on them with their bare feet to agitate the fabric and release the grime. While this method might sound like the stuff of nightmares, it was remarkably effective and was used throughout the Roman world—and, in some places, well into the medieval period. For a deeper look into these ancient laundries, check out this paper published in the Journal of Urology.

Tooth whitening and mouthwash

One of the most unsettling uses of urine was in Roman dental care. Some historical texts claim that urine was used to clean and whiten teeth. The ammonia once again played a role here, acting as a bleaching agent. This wasn’t a fringe practice, either. Some sources suggest it was relatively widespread among certain classes.

Even more surprisingly, Pliny the Elder claimed that the strongest and most effective urine for whitening came from the Iberian Peninsula. As a result, Roman traders supposedly imported urine from Portugal because of its superior properties. While it’s hard to verify how common this was in practice, the fact that it was even mentioned gives a pretty vivid picture of how little Romans flinched at the idea.

Leather tanning and treatment

Roman leatherworkers used urine to prepare animal hides for clothing, footwear, and military gear. The first step in this process involved soaking the hides in a urine solution to loosen the hair and soften the skin. The chemical content of urine, particularly the ammonia, made it easier to scrape off hair and unwanted tissue.

After this treatment, the hides were dried and cured, becoming pliable enough to craft into everything from sandals to shields. The process was unpleasant and labour-intensive, often performed in the outskirts of cities due to the overpowering stench. Yet it was considered an essential trade, crucial for supplying the empire’s vast needs.

Textile dye fixing

Dyeing fabrics in ancient Rome wasn’t just about colour. It was about permanence. Urine served as a mordant, a substance that helps fix dye to fabric fibres. When preparing cloth, Roman dyers would soak it in urine to strip away oils and prepare it to better absorb pigment. This helped ensure that dyed clothing would retain its colour for longer.

This was especially true for high-status colours like Tyrian purple and deep reds, which were not only expensive to produce but also important social signifiers. Clothing marked class and status in ancient Rome, and urine, oddly enough, helped make that possible.

Bleaching wool for fine garments

Before dyeing could even begin, wool often needed to be whitened, especially if it was destined to become a brightly coloured tunic or toga. Roman textile workers used urine to bleach raw wool, soaking it to remove impurities and natural oils that dulled the fibres.

This not only helped with cleanliness but allowed for a cleaner, crisper dye application. Despite how off-putting it may sound, the use of urine in preparing fine fabrics shows the lengths to which Roman craftspeople went to get the best results, and the trust they placed in this strange but functional substance.

Medicinal remedies and home treatments

While Roman medicine might have been advanced in many ways, some of its recommended treatments are more eyebrow-raising. Among them: the use of urine in healing and cleansing. Some physicians and healers believed that urine could treat skin conditions, clean wounds, and even help with infections.

Celsus, one of the key medical writers of the Roman era, listed urine as a topical antiseptic in certain remedies. Urine was also used in poultices and occasionally consumed in small quantities in the belief that it had curative properties. While modern science doesn’t back up most of these claims, it does show how experimental Roman medicine could be.

Fertiliser for crops and gardens

Human and animal waste was too useful to waste in a society that prized self-sufficiency. Roman farmers used urine as a nitrogen-rich fertiliser, applying it to fields and gardens to promote plant growth. Its high levels of phosphorus and potassium also helped improve soil health and boost crop yields.

In an age without synthetic fertilisers, this was considered a smart and pragmatic approach to agriculture. Today, some organic farming practices still draw on similar principles, proving that, however unpleasant it may sound, the Romans were ahead of their time. A recent Nature study even explores the revival of human urine in modern sustainable farming.

Cleaning streets, floors, and bathhouses

Urban maintenance in ancient Rome was no small task. With large cities full of people and animals, streets got dirty quickly. To deal with the grime, public sanitation workers would sometimes use diluted urine to wash pavements, courtyards, and other public areas.

It worked as a sort of early disinfectant, especially useful in bathhouses and public lavatories where hygiene was a concern. Some streets even had designated amphorae or jars placed to collect urine for public use. It’s a strange but early example of municipal recycling in action.

Turning waste into profit: the urine tax

By the first century CE, the Roman government had caught on to the value of this pungent commodity. Emperor Vespasian famously introduced a tax on urine collected from public urinals, recognising its economic value to fullers, tanners, and other trades.

When his son Titus questioned the logic of profiting from something so unpleasant, Vespasian allegedly held a coin to his nose and said, “Pecunia non olet”—“money doesn’t stink.” The saying stuck, and the tax became one of the more curious fiscal policies of the empire. To this day, the name vespasienne is still used for public urinals in France.

Folklore around sobering up

While there’s limited evidence of it being widespread, some Roman writings hint at the belief that stale urine could help sober up a drunk person. Whether it was sniffed, applied externally, or, in some extreme rumours, drunk, it was thought to have restorative properties.

Most historians treat this claim with caution. It was likely a fringe belief or misunderstood folk remedy, but it illustrates how far the Romans were willing to push their ideas about the usefulness of bodily fluids.

To modern sensibilities, the widespread use of urine in ancient Rome might sound like a darkly comic anecdote.

However, it’s much more than that. It reflects a society that was practical to a fault, willing to test, reuse, and repurpose even the most unlikely substances. From maintaining city streets to bleaching elite textiles, urine found its place across Roman life in ways that continue to astonish historians.

Their acceptance, even embrace, of this unlikely resource offers a striking reminder that innovation often comes from discomfort, and that solutions to practical problems don’t always align with modern tastes. It may be unpalatable, but it was resourceful, and the Romans never let social taboos stand in the way of getting a job done.