JpGU-AGU Joint Meeting 2020

Presentation information

[J] Poster

O (Public ) » Public

[O-04] Poster presentations by senior high school students

convener:Tatsuhiko Hara(International Institute of Seismology and Earthquake Engineering, Building Research Institute), Katsuyoshi Michibayashi(Department of Earth and Planetary Sciences, Nagoya University), Miwa Kuri(Japan Meteorological Agency), Keiko Konya(Japan Agency for Marine-Earth Science and Technology)

[O04-P21] Indicate the intensity of ultraviolet rays using the degree of fading of cotton yarn dyed with reactive dye

*Natsuki Yamamoto1, *Ayaka Akase1, *Kento Takase1, *Reiji Iwamoto1, *Keisi Okumi1, *Mayu Naito1, *Hiromu Fujimoto1, *Yamato Yasuhara1, *Nanami Kishimoto2, *Sayuki Fujii2, *Nagisa Yokoyama2, *Soya Obata2, *Hinako Kobayashi2, *Haruki Murakami2, *Reo Yamada2, *Syo Yoshida2 (1.Hyogo Prefectural Himeji Higashi Senior High School Science Club ( Ultraviolet rays team ), 2.Hyogo Prefectural Nishiwaki Senior High School Earth Science Club)

Keywords:reactive dye, intensity of ultraviolet rays, fading

Ultraviolet rays fade the color of clothing. We thought that the intensity of ultraviolet rays could be indicated using the degree of fading of cotton yarn dyed with a reactive dye. The following three points became clear as a result of irradiating the cotton yarn of three colors of blue, yellow and red with ultraviolet rays. (1) Ultraviolet rays damage fibers, and the strength of fibers becomes extremely low after the sixth day of irradiation. (2) The ratio of magenta to cyan decreases until the sixth day of irradiation, and the blue and red yarns fade. This indicates that magenta has been destroyed by ultraviolet rays. (3) This tendency is not seen in the yellow yarn. The yellow yarn is less likely to fade than the blue and the red yarn. The intensity of ultraviolet rays can be indexed by the ratio of magenta dye to cyan.