Coffee Waste Becomes Printing Ink in Finland

Every day, coffee production creates mountains of waste that usually ends up in landfills. But a team in Finland saw something else: the raw materials for a revolution in sustainable printing.

Natural Indigo Finland just won the Sustainable Innovations competition at this year's PacTec Fair for developing printing ink made entirely from coffee production waste. The company partnered with Tampere University of Applied Sciences and global ink manufacturer Siegwerk to turn what coffee producers throw away into valuable printing material.

The water-based ink uses bio-based pigment extracted from waste coffee supplied by Meira, a Finnish coffee company. It contains no harmful VOC compounds, and its binder system comes from renewable raw materials. Since their first successful test in May 2025, the research team has steadily improved both the color strength and technical performance.

Kai Lankinen, who leads the university's Biocolores research group, explains that his team has studied turning waste into dyes for years. This project proved their research could jump from the lab into real-world use. The innovation caught attention beyond Finland too, earning a spot in London's "New wood: Building a Bio-Based Future" exhibition at The Garrison Chapel this month.

The jury chose Natural Indigo Finland's project over two other finalists because it creates new value within existing business operations. Judge Antro Säilä from the Finnish Packaging Association said that practical integration made all the difference. The team took home a €5,000 prize from the Finnish Fair Foundation.

The Ripple Effect

The packaging printing market represents hundreds of billions of euros globally. If coffee-waste ink can scale up, it could replace petroleum-based inks across countless products while solving a waste problem at the same time.

Lankinen's team now focuses on bringing the solution to manufacturers worldwide. Each ton of coffee waste diverted from landfills becomes printing ink instead, turning a disposal cost into a revenue stream. Coffee shops and roasters generate this waste constantly, creating a reliable supply chain for sustainable ink production.

The collaboration shows how universities, startups, and established companies can solve environmental challenges together while building profitable businesses.

A cup of coffee might give you energy for the morning, but its leftovers could soon be printing the packages you see on store shelves.