What is Utsubushi-iro (空五五子色)? An explanation of the origin, history, and color scheme of this traditional Japanese color.

Japanese Color Encyclopedia
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空五倍子色の色見本 HEX #9D896C
Japanese color name sky fivefold color
reading utsubushiiro
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RGB 157, 137, 108
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What is "Sora-gobaishi-iro"? Origin and etymology.

The color "gobaishi-iro" is a dye derived from galls (also read as "fushi"), which are insect galls formed on the leaves and young shoots of the sumac plant (Rhus javanica), a member of the Anacardiaceae family, when a type of aphid infests them. Galls are very rich in tannins and have been used since ancient times as a black or brown dye, as well as a folk medicine and an ingredient in teeth blackening.

The "utsu" in "kugobaishi" refers to a gall that is hollow inside. By powdering these kugobaishi and reacting them with an iron-containing mordant, a unique grayish-brown color is produced.

The historical background of the color gallnut

Dyeing with gallnuts is believed to have been practiced as early as the Heian period, and descriptions of its use as a dye can be found in the Engishiki, a compilation of court ceremonies and regulations. Initially, it was mainly valued as an underdye for dyeing black, or as a raw material for black dye itself. In the Edo period, due to its subdued color and the durability of the dye, it came to be used in a wider range of social classes, including samurai formal attire and everyday clothes for commoners.

Given the historical context of restrictions on extravagant colors, these subdued shades were likely favored.

Related literature, waka poetry, and seasonal words

While the color name "Kuwabushi-iro" (空五五子色) doesn't appear directly in many literary works, its raw material, "gobabushi" (五五子), has been known since ancient times. For example, "The Pillow Book" mentions the use of gobabushi as an incense (fragrance) under the heading "Fushi no Takimono" (火子の火物). This suggests that gobabushi was a familiar part of the lives of Heian-period aristocrats.

Its subdued and calming colors resonate with the later aesthetic of wabi-sabi, and can be said to evoke the withered landscapes and quiet scenes depicted in literary works. As a seasonal word, "gallnut" indicates autumn.

Color scheme preview

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Suggested color scheme in sky gallnut color

sky fivefold color
Indigo
Withered color
generation color

Indigo (#274A78)

This color combination was commonly seen in the clothing of common people during the Edo period. The deep blue of indigo and the calm brown of sky gallnut complement each other, creating a simple, practical, yet tasteful impression. It is a color scheme that evokes a traditional Japanese atmosphere.

Withering color (#836A4A)

This combination of calming, plant-derived colors is another example. The gallnut yellow and withered yellow colors share similar hues and brightness levels, creating a unified and gentle gradation. The color scheme evokes the tranquil and profound impression of autumn nature.

Color produced (#FBFBF4)

By combining it with a soft, natural white, the earthy warmth and subtlety of the gallnut color stand out. It avoids strong contrasts while achieving both brightness and tranquility. This color scheme gives a natural and elegant impression.

Practical Scenes

In the world of traditional Japanese clothing, the color "kurogobai" (sky gallnut yellow) is often used for everyday, unpretentious attire such as tsumugi silk, komon (small patterned silk), and cotton kimonos. Its subdued hue harmonizes well with other colors and is particularly suitable for expressing the feeling of autumn. Incorporating it as the color of a obi (sash) or obi-jime (sash cord) creates a stylish and refined look.

In interior design, using it in wallpaper, curtains, and furniture upholstery brings warmth and tranquility to a space. It pairs well not only with Japanese modern spaces but also with natural and vintage-style interiors. Its appeal is further enhanced when combined with natural materials such as wood and diatomaceous earth.

In web and graphic design, using white as a background or accent color can convey images of trustworthiness, tradition, and nature. It is particularly suitable for websites dealing with historical brands, organic products, and traditional crafts. To ensure readability, it is generally combined with light colors such as white or off-white.

FAQ

❓ What dyes are used to make the color "Sora-gogakushi" (a type of gallnut color)?
The raw material is dried and powdered galls ("fushi") that form on sumac trees. The tannins contained in these galls react with an iron-containing mordant to produce a distinctive grayish-brown color.
❓ What is the difference between gallnut brown and other traditional brown colors?
Compared to other brown shades such as chestnut brown or sooty bamboo brown, the gallnut brown color is characterized by its slightly grayish, muted hue. This is due to the chemical reaction between the tannins in the dye and the iron mordant, giving it a subdued and calm impression.
❓ What are the modern uses of the color "Sora-gobai-iro" (a type of slang)?
Even today, it is used in traditional kimonos, Japanese accessories, and plant-dyed products. Furthermore, its calming colors make it useful in various fields where a Japanese aesthetic is desired, such as interior design, fashion, and web design.

Japanese color similar to gallnut yellow

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