OK Fools was the first Fool's Cap paper produced in Japan by Ohtori Paper. In Japan, the term "Fools Paper" has long been used to refer to high-end writing paper. British Fool's Cap paper was first imported into Japan in the late 1800s. The popular Japanese version was produced at the Oji Ogura Factory, where the name OK comes from. While the current iteration is being made by Nippon Paper Industries Yatsushiro Factory, they have kept the OK name for brand recognition.
Yamamoto's ink tests with blue and black Sailor and Platinum inks showed no feathering nor bleed-through. Very wet reddish-pinkish J. Herbin inks showed slight feathering and bleed-through. Yamamoto recommends writing with Medium or finer nibs.
- Size: A4
- Grain direction: Long grain