The wallpapers are digitally printed with QA-P dry toner for excellent image quality. QA-P toners also contain no hazardous chemicals, so they are compliant with the US and EU black lists, US-C-070928PROPIC-65 and UE Standard EN71-3 (heavy metals). Throughout the manufacturing process,serious consideration is given to environmental aspects: Equally important, the wallpaper are recyclable and biodegradable.