Collection: Sea Change

A Riot of Colours: Pili and Its Journey to Decarbonise Dyes and Colours

Pili has a mission—it produces decarbonised alternatives based on renewable resources for sustainable industrial applications. Pili President Jérémie Blache explains how Pili uses hybrid processes combining industrial fermentation and organic chemistry to manufacture sustainable, high-performance colour ranges for the textiles industry.

Long Story, Cut Short
  • Marie-Sarah and Thomas came together through their shared vision of creating sustainable solutions using biotechnology. They launched an educational project called "Grow Your Ink," showcasing how sustainable ink could be produced using micro-organisms.
  • The prevalent form of dyes and colours has a significant environmental drawback—99% are derived from fossil resources, contributing to pollution and climate change.
  • While shifting away from petrochemical-based dyes is a crucial step, it is not sufficient on its own to achieve a satisfying decarbonisation of the textile industry.
Pili has partnered with Orta, the Turkish denim manufacturer and Citizens of Humanity, a California-based high-end denim brand known for its commitment to quality and sustainability.
Denim Shift Pili has partnered with Orta, the Turkish denim manufacturer and Citizens of Humanity, a California-based high-end denim brand known for its commitment to quality and sustainability. Together, they are beginning a transformative shift in the denim industry with the commercial launch of the first garments dyed with Pili’s biobased indigo. Citizens of Humanity Group

texfash: Your website lays the context: "After a decade of existence, Pili's ramp-up and entry into the industrial landscape is setting down its identity and positioning in a singular way." Please give us an overview of what happened in this decade.
Jérémie Blache: Over the past decade, Pili has transformed from a R&D-focused startup into an industrial company in the field of sustainable dyes and pigments. This shift was driven by significant technical achievements, leading to the successful production of the first tonnes of biobased dyes in 2024. It already represents 100,000 textile articles on the market this year.

A decade ago, the environmental impact of colours was largely overlooked. Today, an increasing number of brands and consumers recognise that conventional fossil-based dyes are highly polluting. For instance, the dye used for a single textile article can account for up to 10% of its total carbon footprint.

How did co-founders Marie-Sarah Adenis and Thomas Landrain get together? What was it that you individually brought to the table?
Jérémie Blache: Marie-Sarah and Thomas came together through their shared vision of creating sustainable solutions using biotechnology. They launched an educational project called "Grow Your Ink," showcasing how sustainable ink could be produced using micro-organisms. This initiative captured the attention of the public, media, brands, and industry leaders alike. In response to this societal interest, Jérémie Blache and Guillaume Boissonnat-Wu joined the team, bringing the expertise and resources necessary to transform the concept into an industrial reality, and created Pili.

What do you think was wrong with the prevalent form of dyes and colours. What was the intervention you sought to make?
Jérémie Blache: The prevalent form of dyes and colours has a significant environmental drawback—99% are derived from fossil resources, contributing to pollution and climate change. As the market becomes more aware of these environmental pollutions, many stakeholders are seeking ways to reduce reliance on petrochemicals and adopt circular solutions.

To address this issue, Pili developed an innovative process to produce sustainable colorants. These biobased dyes match the vibrancy, colourfastness, and uniformity of conventional options while significantly reducing their carbon footprint. By decarbonising the colour industry, Pili aims to transform the textile market, delivering solutions that prioritise both high-performance and sustainability.

What was the concept/vision that you had when Pili was launched? Did this idea have to be refined or modified as you went along? If so, what and why?
Jérémie Blache: When Pili was launched, our team focused on using biotechnology exclusively to produce sustainable colours. However, as we progressed, it became clear that achieving the same level of performance as conventional dyes through biotechnology alone was a significant challenge. That is why Pili developed hybrid processes combining fermentation and organic chemistry.

This refined approach not only allowed Pili to address the needs of the colour industry but also opened doors to decarbonise other markets, including fragrances and cosmetics, through the production of biobased aromatic compounds.

The first biotech lab was created at Toulouse White Biotech in 2016. What did this lab seek to do? How were the other subsequent labs different (the R&D laboratories at CNAM and the chemistry lab at Le Kremlin-Bicêtre)?
Jérémie Blache: The first biotech lab was established at Toulouse White Biotech in 2016, where Pili focused on developing and optimiing its fermentation processes. On the other hand, the chemistry lab, originally located at CNAM and later moved to Le Kremlin-Bicêtre, took on a complementary role, concentrating on the development and optimisation of chemical processes to create range of dyes and pigments.

Last year, Pili announced the "successful industrialisation of Pili fermentation processes and production of the first tons of biobased aromatic compounds." Could you explain this for the layperson?
Jérémie Blache: This biobased aromatic compound that we have developed is a precursor of Pili indigo obtained through fermentation. It’s a building block which can be converted into numerous high value biochemicals or biomaterial for different applications (colorants, fragrances, flavours, pharmaceuticals or cosmetic ingredients for instance).

Pili calls itself "Carbon Conscious Color Company". Was this so from the beginning? What were the ideas that went into this positioning of your company?
Jérémie Blache: Pili has been committed to being a "Carbon Conscious Color Company" since its inception. The idea behind this positioning relies on the understanding that while carbon is essential to life on Earth, its excessive concentration within the atmosphere—as a result of current human activities—is threatening the climatic balance that humans and other organisms need to live in safe conditions.

Being “carbon conscious” is a way of being responsible and aware of carbon cycles and the need to limit our emissions. Our ambition is also to guide consumers and regulators towards adopting more mindful practices, emphasising resource efficiency and awareness of the environmental impacts associated with colour production and use. This commitment is present at the core of Pili’s identity from the very beginning. Being “carbon conscious” also lead us to be aware of the other planetary boundaries that must be respected to preserve decent living conditions on earth.

On the other side, being a "colour company" means being a producer of colours that are essential to Humanity. They give us a better picture of the world, move us and accompany us in so many life's events. Opting for responsible colours is an opportunity to share hope for future generations. It's striking for us to realise the positive emotion that wearing “carbon-conscious” colours can bring on a daily basis.

Today, 99% of colours are produced using fossil fuels. So, do you think that simply shifting away from synthetic dyes itself is enough for decarbonisation? Please elaborate.
Jérémie Blache: While shifting away from petrochemical-based dyes is a crucial step, it is not sufficient on its own to achieve a satisfying decarbonisation of the textile industry. Dyes and fibres are the two primary components of textile products with the greatest environmental impact during their production. Dyes alone account for about 5–10% of a textile article’s carbon footprint, making their environmental impact a critical element that can no longer be outlooked in efforts to decarbonise the whole supply chain.

Fortunately, existing solutions for both components are readily available and can be implemented. Brands have the ability to make a significant impact by transitioning to sustainable dyes and choosing regenerative or recycled fibres.

The third and equally critical factor in decarbonisation is the energy source used by textile manufacturers—a factor over which brands have far less control.

With the emergence of companies that are heavily involved in sustainability, or even dependent on sustainability like Pili, more and more pressure will be exerted by the economic sphere itself to accelerate the ecological transition, which was not a majority trend until now, this is another important sign of hope.

Could you explain the industrial fermentation process that Pili follows? How does this work? How much time does it take to produce x tonnes of your product? How does it compare to a standard synthetic dye in terms of amount needed to dye x metres of fabric?
Jérémie Blache: During fermentation, we use biomass to feed and cultivate selected micro-organisms to produce biobased aromatic intermediates. These processes offer a high degree of reproducibility and are widely used in industry, particularly in the pharmaceutical and food sectors, to manufacture a wide range of compounds.

Once fermentation is complete, we proceed to filtration, to separate and extract the aromatic intermediate from the fermentation medium. From this biobased building-block we create dyes and pigments, applying the principles of green chemistry (low temperature, water as solvent, catalytic method to avoid waste...).

Pili indigo is a direct replacement for conventional indigo in mill dyeing processes, no need to invest in new machines. It delivers the same performance in terms of shade and color fastness.

Jérémie Blache
Jérémie Blache
President
Pili
Thierry Augereau

The prevalent form of dyes and colours has a significant environmental drawback—99% are derived from fossil resources, contributing to pollution and climate change. As the market becomes more aware of these environmental pollutions, many stakeholders are seeking ways to reduce reliance on petrochemicals and adopt circular solutions.

Pili offers a low-carbon direct replacement for petro-based indigo without compromising on performance and scalability.
The Alternative Pili offers a low-carbon direct replacement for petro-based indigo without compromising on performance and scalability. It meets the same performance as petrochemical indigo while seamlessly integrating into existing dyeing processes without requiring additional investment in commercial dyeing equipment. Marie-Sarah Adenis

Your primary raw material is biomass from agricultural resources. Where do you source this from as of now? Could you give us an idea about what quantity of biomass is needed to produce, say, 1000 tonnes of your product?
Jérémie Blache: We use European biomass to manufacture our products. Chemically speaking, we need few units of glucose to make one unit of dye.

It’s worth noting that the current annual global production of industrial sugars from biomass stands at around 200 million tonnes, a very small portion of this amount will be more than enough to replace all the world's petro-based dyes.

Additionally, Pili is actively involved in international research projects focused on developing second-generation sugars. These are derived from paper and wood waste as well as recycling streams from the textile industry, further enhancing our commitment to circularity. The future of colour (and a part of the chemicals industry) will be highly circular and will not require fields to grow renewable raw materials.

What was the reason you started with denim colorants? How much dyes does the denim industry consume in a year? If Pili has to make an impact, how much do you need to produce annually? And yes, how do prices compare?
Jérémie Blache: The textiles industry is among the most polluting sectors, with denim production significantly contributing to this environmental impact. Over 3 billion pairs of jeans are sold annually, requiring approximately 70,000 tonnes of indigo dye. The manufacturing of conventional indigo relies on polluting petrochemical processes using toxic chemicals such as aniline and cyanide.

To make a meaningful impact, Pili is setting a long-term roadmap aiming at gradually replacing petrochemical dyes with biobased alternatives. This strategy begins with targeting the premium market, which is already willing to adopt innovative and sustainable solutions. By scaling up production and demonstrating the effectiveness of our bio-based indigo, we aim to expand our reach and contribute significantly to the decarbonisation of the whole industry.

Initially, Pili’s bio-based indigo will be sold at a premium to cover the higher production costs and support the development of our production tools. However, as the company scales production and benefits from economies of scale, we anticipate a significant reduction in costs. Within five years, we expect to cut these costs by half so premium brands will no longer have any excuse to continue using fossil dyes and many other brands will be able to adopt colours that are more respectful of humans and our environment.

Pili
Cotton yarn being dyed. Pili's biobased indigo will make its debut in Citizens of Humanity and AGOLDE’s Spring 2025 collections. Laurence Ellis / Citizens of Humanity
 
 
  • Dated posted: 17 February 2025
  • Last modified: 17 February 2025