However, in the process of wallpaper construction, the coated glue contains a lot of harmful substances such as formaldehyde.
In home improvement materials, we can't just determine whether a material contains toxic and harmful substances and whether it is environmentally friendly. It also depends on what auxiliary materials are needed in the construction process. For example, the wallpaper mentioned above has no formaldehyde in itself and is considered as a green material. But wallpaper is glued to the wall, as long as it is glue, there will be formaldehyde, and so on. It is impossible to stick the wallpaper and the wall closely with tap water and keep it from falling off.