Mizutamagami or waterdrop paper is a perforated decorative paper made since the Edo period (1603-1868). It is obtained by spraying kozo fibers on a sheet of paper (gampi) through a stencil or gampi fibers dyed with indigo are dropped on the surface of a sheet of white paper. Then, water is sprayed on the surface to make white stains.
The paper can also be coated on a sheet of heavy paper and is then called Rakusuishi (falling water paper).