Shiroutsuri is a variety that has a continuous pattern of Utsurizumi, which is derived from the black background, just like Showa-sanshoku. The white and black body color is monotone with no red imprints. It looks similar to the “white tortoiseshell” that will be introduced later, but the color of the ink is different. It is easy to understand if you remember that Showa-sanshoku without the red imprints is Shiroutsuri, and Taisho-sanshoku without the red imprints is Shiro-bekko.
For Shiroutsuri, it is said that the one with more white imprints and the ink pattern that is well-proportioned from head to tail and swirls up is good.

JAS No.2004 Shiroutsuri
Shiroutsuri has a black body, and there are white imprints across the body. There are also individuals that have "utsuri-zumi"across the body. Similar to Bekko, but distinguishable from the black background.