The spa town dates back to medieval times
Today, in Wiesbaden, tourists can easily visit the hot springs and fountains, and drink their mineral-rich water, although it is not meant for daily consumption, since its potency makes it unsuitable to drink for long durations, unless medically advised. Like other hot springs around the world—they are found in Iceland, New Zealand, Australia, Japan, Turkey and the US—Wiesbaden’s springs are geothermally heated by deep-seated rocks beneath the earth’s crust. As the heated water flows through faults in the crust, a combination of heat and pressure causes it to gush out of the ground surface.
Wiesbaden’s springs supply almost 2 million litres of hot water every day, and have given rise to several modern day bath facilities that attract curious tourists from around the world. The city’s most prominent hot spring is Kochbrunnen, located at the historic square of Kranzplatz, where it is now surrounded by the state chancellery of the federal state of Hessen, and luxurious hotels like the Schwarzer Bock and Palast Hotel. Kranzplatz was a thermal facility for the Romans, while Schwarzer Bock dates back to the 15th century, and has its own spring.
Like in the past, Kochbrunnen stands its own ground amidst its historic counterparts, gushing out almost 880 litres of water in a minute. Shaped like a shell, its water is hot, at 68°C, and gives rise to slight steam bubbling at the top of the opening from which it sputters out. Next to Kochbrunnen is a small fountain from which visitors can drink its filtered water. The hot water is extremely salty, courtesy the high concentration of sodium. It also contains calcium, potassium, magnesium, strontium and hydrogen carbonate.
Sinter deposits from the water form uneven coatings of red and yellow sedimentation. In ancient times, these sediments were in high demand among Roman women who had dark hair, and who aspired to meet the beauty benchmarks of having red hair. Twice a year the sinter deposits were scrapped off, and sold as Mattiac balls, which were used to add a red tint to dark hair.
The significance of hot springs in Roman life can be gauged by the fact that Gaius Plinius Secundus, known as Pliny the Elder, who was a Roman writer and commander wrote about them, and the Roman poet Martial wrote about ‘mattiakischenKugel’ which helped prevent hair loss.
The current day utility of this water is to heat some of the nearby buildings. The rest of it is filtered and directed through pipes to Thermalbad Aukammtal and Kaiser-Friedrich-Therme, a couple of the popular thermal facilities of Wiesbaden, the latter being built on the foundations of a former Roman sweat bath.
(This story appears in the 05 July, 2019 issue of Forbes India. To visit our Archives, click here.)