Paper used for Japanese umbrella is vat-paper as well as machine-paper and oiled these Japanese paper, which is chiefly made from paper-mulberry.
This report shows the superiority of those oiled-papers of various kind which are practically used after having examined their physical and chemical characteristics, and concluded as follows.
(1) Japanese paper, if colored, increases its intensity.
(2) Colored paper, when oiled, is not generally intensified, but, in case of white paper, it increases intensity.
(3) To speak of oil, perilla oil or the one mixed up with a small quantity of paulownia oil is recommended.
(4) When oil is twice coated, intensity is increased, but inferior oil such as substitute oil may not be very much beneficial even if twice coated.
(5) As oiling method, hand-appling with waste-silk available at present is not abtained good results, it should be improved.