his study investigates Ceriops tagal propagules from Bintan Island as a source of natural dyes for ecoprint batik using the iron blanket method. Phytochemical screening identified alkaloids, flavonoids, polyphenols, and tannins, while FTIR characterization revealed prominent hydroxyl groups. From a coastal ecosystem perspective, the research highlights the chemical value of mangrove bioresources and their potential to support local textile enterprises. Sustainable application requires responsible propagule harvesting that safeguards natural mangrove regeneration.