In 2017, the people in Mumbai, India saw something strange happening with the stray dogs of the city. The dogs all seemed to be turning a light blue color. People reported to the Maharashtra Pollution Control Board that a company in the Taloja Industry area was dumping indigo dye, which was primarily used by that company, in the local Kasadi river. The dogs were hunting for food in the area and, consequently, their fur was turned blue. Authorities quickly shut down the factory to prevent more dye from entering the river, but the question remained about how toxic this dye is not only to the animals but the locals as well? With the long history of indigo dye and India, why has this only recently become a problem?

Indigo Dye in India

Indigo is a natural dye, but unlike most natural dyes, indigo dye penetrates clothes directly when heated. Indigo dye and India are correlated because the country had been using it naturally for centuries. Now, however, most factories use a chemical agent called mordant to increase the number of clothes produced in less time. Mordants can be just acidic, not necessarily toxic, but most companies choose to use mordant with aluminum and chromium. Both of these can cause great damage to the ecosystem. Factory wastewater can poison rivers, killing plants, animals and poisoning drinking water for the people of India.

Even without mordants, natural indigo dye is not great for the environment either. It is slow to decompose and darkens river water, so flora and fauna starve from lack of sunlight. That is why the dogs of Mumbai turned blue upon entering the river. The best approach to preventing toxic dyes from entering and poisoning the rivers is prevention and filtration. If factories used local plants for dyes, that would help filtration. Prevention is tricky. Scientist Juan Hinestroza is working on using nanotechnology to apply dye directly to cloth fibers. If this is successful, it would make toxic dyes and mordants obsolete.

Water Pollution

Groundwater, rivers and streams are being severely affected by this fashionable color. With such a high demand for cheap clothes in indigo, like denim jeans, factories and workshops find cheap, quick ways to produce products at high volumes. Tirupur, India is home to many factories specifically used for making and dyeing clothes. These factories have been dumping the wastewater from production into rivers in the area. Despite tougher regulations, they continue the process, rendering local and groundwater undrinkable.

With dying waters and a rising population, India is struggling to clean up its rivers. The fight is far from over, and people have turned to the government for an answer. Activists are heading to court to get municipalities and states to rise and take action. They started with one demand for the restoration for the Mithi river, a river polluted with dye, paint and engine oil. Citizens started legal petitions then gathered volunteers to get other rivers in the area cleaned up. After a terrible flood in 2005, dams were built to reduce overflow, which was helpful because the rivers are now split it in two.

Back To Nature

India is one of the few countries that produce indigo and denim clothes at high volumes, so the ways of naturally applying indigo to clothing is a long lost art. However, one designer is working to change that. Payal Jain, a fashion designer in India, is bringing back the natural ways of getting indigo straight from the plant and onto the clothes. Using mud and intricate wood carvings, artisans use this method to print the color directly to the fabric. Bringing back traditional ways of dying could relieve the environment from toxic, synthetic dyes.

Blue dogs appearing in the streets, poisoned rivers and groundwater, crops dying and limited access to clean drinking water are all direct results of indigo dye waste being dumped into the rivers. As long as factories continue to dump dye waste into rivers, this problem will persist. The citizens of India are coming together to clear the neglected rivers and push for tougher regulations on clothing factories. With the government’s support and the use of new scientific methods to dye clothing, Indigo dye in India could remain popular without being dangerous.