Urushi lacquer: at the heart of Japanese craftsmanship
BEFORE THE GOLD OF KINTSUGI, THERE WAS URUSHI.
Urushi is a natural vegetable lacquer derived from the sap of the lacquer tree, Toxicodendron vernicifluum.
Used for millennia in East Asia, it occupies an essential place in Japanese craftsmanship. It allows for the protection, assembly, restoration and decoration of wood, ceramics and many art objects.
In traditional Kintsugi, Urushi constitutes the fundamental material of repair: it is involved in the assembly of fragments, the filling of gaps, the finishing layers and the preparation intended to receive the metallic powders.
A natural lacquer derived from a tree
Urushi-kaki — The claw of patience
Urushi sap is extracted from the Toxicodendron vernicifluum tree using a demanding traditional method called urushi-kaki. Fine incisions are made in the bark to collect, drop by drop, a precious quantity of sap.
As the season progresses, the quality of Urushi evolves and each harvest period has a name: Hatsu-urushi the first harvest; Sakari-urushi, harvested in the heart of summer and particularly appreciated; Sue-urushi, the late harvest; then Urame-urushi and Tome-urushi, which mark the last harvests of the season.
Thus, the same tree offers, over the months, lacquers with different characteristics, whose viscosity, transparency and behavior vary according to the time of harvest.
A thousand-year history
From Jōmon to Edo: Urushi in Japanese art
The art of lacquerware dates back several millennia in Japan. Over the centuries, Urushi has become both a protective material and a true artistic medium.
Boxes, bowls, ceremonial objects, furniture and decorative works testify to the sophistication achieved by Japanese artisans.
Lacquer techniques gradually developed until reaching a very high level of mastery, particularly in Japanese decorative arts.
How does urushi harden?
A material that needs moisture
Unlike conventional paint or varnish, Urushi lacquer does not simply air dry: it hardens through polymerization. This process is favored by a warm and humid atmosphere, which notably allows laccase, an enzyme naturally present in the sap, to participate in the transformation of urushiol.
The freshly lacquered pieces are then placed in a muro (室), an enclosure where humidity and temperature are controlled. Layer after layer, the Urushi transforms and forms a resistant and durable film.
Urushi in traditional Kintsugi
The invisible matter behind the gold
Kintsugi is not simply about depositing gold on a break.
In the traditional method, Urushi accompanies the restoration at different stages, from the assembly of fragments to the finishing touches.
Mugi-Urushi
A mixture of lacquer and flour used as a traditional adhesive to assemble fragments.
Sabi-Urushi
A mixture of lacquer and mineral powder used especially to fill and prepare irregularities for repair.
Kuro / Roiro Urushi
Lacquers used during the finishing work to obtain a precise surface before the final stages.
E-Urushi
Lacquer used especially as a coating to allow the application of metallic powders.
From deep black to the brilliance of gold
In Kintsugi, gold attracts the eye . But it is Urushi that builds the repair.
Discover the Urushi glossary →
Is Urushi dangerous?
Precautions during handling
Fresh Urushi contains, among other things, urushiol, a substance that can cause a significant skin reaction in some people.
When handling it, it is therefore essential to avoid any contact with the skin and to use appropriate protective equipment.
Once properly polymerized, its properties are very different from those of fresh lacquer.
Read: Urushi and Rhus dermatitis →
Iro-Urushi: Color in Japanese Lacquer
The Urushi palette.
Iro-Urushi refers to colored Urushi lacquers, obtained by incorporating pigments adapted to the lacquer.
While black and red are among the iconic colors of Japanese lacquer art, Iro-Urushi offers a much wider palette: browns, yellows, greens and other shades allow you to play with color while retaining the characteristic depth of Urushi.
Applied in thin successive layers, then worked and polished according to the desired finish, the lacquer gradually reveals its color and depth.
In Kintsugi, Iro-Urushi also allows for the creation of colored repairs, with or without metallic powder. This serves as a reminder that Urushi is not only a material for repair: it is also a material for creation.
→ Discover our Iro-Urushi and pigments
Fuki-Urushi — The natural beauty of wood
Fuki-Urushi — Urushi that reveals the wood
Fuki-Urushi, which can be translated as "wiped Urushi," is a traditional Japanese finishing technique that highlights the natural beauty of wood. A thin layer of Urushi lacquer is applied to the surface so that it penetrates the fibers, and then the excess is carefully wiped away with a cloth. The object is then placed in a muro (drying room), where the humidity and temperature promote the polymerization of the lacquer.
This process is repeated several times, in very thin layers. With each application, the wood is protected and its color deepens, while retaining its characteristic grain and feel. Unlike an opaque finish, Fuki-Urushi does not seek to conceal the material: it gradually reveals the nuances, the fibers, and the unique character of each piece of wood.
Used especially for bowls, trays, utensils and turned objects, this technique illustrates another facet of Urushi, beyond Kintsugi: a material for protecting, finishing and embellishing wood.
→ Discover our lacquers and equipment for Fuki-Urushi
Frequently Asked Questions about Urushi
What is Urushi lacquer?
Urushi (漆) is a natural vegetable lacquer derived from the sap of the lacquer tree, Toxicodendron vernicifluum. Used for millennia in East Asia, it is the essential material for traditional Kintsugi and many Japanese lacquer arts.
What is the difference between Urushi and Ki-Urushi?
Urushi is the general term for Japanese lacquer. Ki-Urushi refers to raw lacquer, used directly in certain techniques or as a base for many traditional preparations.
What is Iro-Urushi?
Iro (色) means "color" in Japanese. Iro-Urushi refers to Urushi lacquers to which suitable pigments are added to obtain reds, blacks, browns and many other shades.
What is Fuki-Urushi?
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