We print the photo wallpaper on HP Latex printers and the inks we use are water-based. The printers have all the necessary certificates to protect the environment. Because the inks are water-based, they avoid harmful fumes and environmentally harmful concentrations in the air. The HP Latex inks are subject to UL ECOLOGO® certification. The UL 2801 demonstrates that an ink meets a set of criteria with multiple characteristics based on life cycle focused on human well-being and the environment. You can find more information about this here: https://www.wallart.com/environmentally-friendly/