Zeefier produces an industrially viable textile dye made from 100% seaweed, biodegradable, chemical-free, and sourced from European side streams. Our innovation is a plug-and-play solution for existing dyehouses and works seamlessly on natural fibres like cotton, wool, and silk. By using seaweed and its side streams from the food, cosmetic, and pharmaceutical industries, as well as collected beach blooms, we eliminate the need for land or freshwater. Our process is scalable, with proven industrial lightfastness, making it accessible to both premium and mainstream markets. Zeefier combines simplicity, minimal ecological impact, and fair production into a circular innovation with the power to drive systemic change.