Originally coated for aerial vegetation mapping, "Z" is a near infrared-sensitive film, offering nice contrast and green shade separation, making it perfect for landscape photography.
Film Washi films are coated by machines in other factories but are not made for regular photography. They may have been designed for exposition through automatic machines, like motion picture sound or leader film, or even not intended for visible light, like X-ray films. Some other are reserved to governmental or military uses, like surveillance films. However, these films can be hacked from their intended use for artistic or fun purposes. That is why Film Washi converts them to standard formats to make them usable in classic cameras.