A new industry initiative is seeking to reduce and eventually remove potassium permanganate, also known as PP spray, from denim manufacturing. PP-free Denim Mission was launched this summer by B2B marketing agency Ruess International in partnership with chemical supplier CHT Germany.
Ruess coordinates the initiative and its communications, while CHT contributes technical expertise and experience in denim finishing. The project aims to move the industry discussion beyond awareness and toward practical implementation of production systems that do not rely on PP.
The initiative has published a guide to the denim ecosystem covering manufacturing and finishing processes, as well as a report titled “Beyond Potassium Permanganate: Perspectives for More Responsible Denim Finishing.” The report reviews available technologies, their capabilities and limitations, and the challenges involved in establishing PP-free manufacturing environments.
According to PP-free Denim Mission, potassium permanganate remains widely used in denim finishing despite concerns about worker exposure and wastewater impacts. The initiative estimates that 1.963 metric tons of PP are used on denim each year. While some companies, including Target, have removed the chemical from their denim production, its use remains common across the industry.
The report notes that potassium permanganate has been classified as a CMR substance—carcinogenic, mutagenic and reprotoxic—under the European Chemicals Agency’s CLP framework since 2018. It also highlights the chemical’s oxidizing properties, acute toxicity and reproductive toxicity, as well as its high-level hazard to aquatic organisms. Applying PP by spraying can expose workers to airborne aerosols and chemical residues.
Replacing the chemical is not straightforward because PP forms part of an established production system. Any alternative must be compatible with existing processes, economically viable and capable of delivering consistent results under industrial conditions. The report describes enzymatic bleaching systems as a significant advance, but not a universal solution, characterizing them as a move toward more controlled and integrated processes rather than a simple chemical substitution.
PP-free Denim Mission argues that progress will depend on cooperation throughout the value chain, including technology providers, laundries, manufacturers, brands and designers. Its proposed 360-degree approach also includes encouraging suppliers to explore PP-free finishing systems, prompting brands to assess lower-impact options, collaborating with NGOs and manufacturing regions, and engaging consumers through awareness campaigns about denim’s environmental impact.
The initiative has not established formal benchmarks or quantitative targets at this stage. Its immediate priority is to develop a shared understanding of what credible PP-free finishing requires, including consideration of worker safety, wastewater effects, resource consumption, process reliability and economic feasibility.
The mission stresses that removing potassium permanganate alone does not automatically make an alternative better. Replacement systems must also demonstrate improvements in environmental and worker-safety performance while meeting industrial requirements for quality, scalability and cost. Its longer-term goal is for PP spray to become unnecessary as credible alternatives gain wider acceptance.
Sources: WWD.