In the early Showa era, Ebisuya sealed natural mineral pigments in test tubes, affixed labels, and sold them. The labels featured a white background with a double red border, and the "Ebisuya Sales" label is an important document for authenticity verification. The mineral pigments in this listing were acquired 20 years ago from a Japanese painter who passed away at the age of 100. ◎ Iwataisha (岩岱赭) No. 13, 14.1g This is a natural mineral pigment of the "Soha (赭)" type, made from natural iron oxide (hematite and limonite). "Soha (赭)" is a general term for reddish-brown colors, and Iwataisha specifically refers to a yellowish-brown. Features: Used to depict earthen walls, rock surfaces, the ground and shadows in landscape paintings, and reddish-brown colors in clothing. Value: Natural Soha pigments from the early Showa era are difficult to reproduce today → High value as historical material. The name "Iwataisha" in particular is unique to art supply stores of the early Showa era and is rarely used today, making it of high value as a historical document. ◎ Hi Akaguchi (緋赤口) No. 10, 6.55g This is a reddish-brown mineral pigment primarily made from natural iron oxide (hematite), and is one of the traditional red pigments, possessing a more subdued and deep color tone than vermilion or cinnabar. It is darker than vermilion, slightly brighter than the deep reddish-brown "Bengara (弁柄)", and the color intensity varies depending on the particle size: coarser particles result in a darker color, while finer particles result in a lighter color. Features: Used in landscape paintings and genre paintings to depict reddish-brown colors in clothing, rocks, buildings, and backgrounds. "Hi (緋)" is a color of high status and was also used in the attire of samurai families and Shinto religious implements. ◎ Honshu (朱) No. 15, 6.55g "Honshu (本朱)" from Ebisuya in the early Showa era refers to a specialized classification of "Honshu" that used natural cinnabar at the time, specifically those with a "strong yellowish tint." The fact that it is a natural cinnabar-based Honshu from the early Showa era makes it extremely rare. It is brighter than Akaguchi and exudes a color tone close to vermilion. It is a rare item with high antique value today. ◎ Kobai (紅梅) No. 9, 11.49g In the early Showa era, the name "Kobai (紅梅)" for natural mineral pigments was sometimes used for "a mixed color of coral powder + red pigments." The yellow and white of the coral powder, and the transparency of the red. It was used as a pale plum-colored intermediate color. It is a pale and soft reddish color. Total: 44g In particular, the natural mineral pigments in test tubes from that era have antique value and are sometimes traded at high prices as research materials and collector's items. (From AI research data) The photos and descriptions are all that are available. Please examine them carefully and we look forward to your purchase.