Ingrain wallpaper

Ingrain (or wood-chip) wallpaper is a decorating material. It consists of two layers of paper with wood fibre in between; different kinds of ingrain wallpaper are distinguished by the size and form of the fibre pieces.

Ingrain wallpaper was invented by German pharmacist Hugo Erfurt in 1864; marketed by the company his grandfather founded, it was first used as a decoration for shop windows, but began seeing use as a wallpaper from the 1920s on as well.