A Japanese company created the thinnest paper in the world and it's used to preserve art at the Vatican and the Louvre — see how it's made

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A Japanese company created the thinnest paper in the world and it's used to preserve art at the Vatican and the Louvre — see how it's made
  • Tenjugo is the thinnest paper in the world, made by a company in Japan.
  • The paper dries to become nearly transparent and is used for repairing historical documents.
  • It's been used to preserve art in the Louvre and the Vatican.
  • Visit Business Insider's homepage for more stories.

The thinnest paper in the world, tenjugo, comes from a single factory in Japan's Kochi prefecture.

Tenjugo was produced by hand for over 1,000 years, until the 20th century. It has been used for ceremonial purposes, including writing and artwork, and later as paper for typewriters, Oliver Whang at The New York Times reported. Now, the paper is made using machines, and is thinner than ever.

Repairing and preserving artwork and historical documents is risky work, and doing so too aggressively risks damaging the original piece. As machines made tenjugo thinner, its clear use became conservation. Tenjugo is used all around the world for conservation, from the Louvre to the British Museum to the Vatican.

Here's how it's made.

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The Louvre, the British Museum, and the Vatican are among Hidaka Washi's customers.

The Louvre, the British Museum, and the Vatican are among Hidaka Washi's customers.
Tengujo paper process. KAZUHIRO NOGI/AFP via Getty Images

The material is used all over the world to restore documents, books, paintings and statues.

The material is used all over the world to restore documents, books, paintings and statues.
Tengujo paper process. KAZUHIRO NOGI/AFP via Getty Images
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It can repair small damaged areas on historical documents, or be used to reinforce entire pages.

It can repair small damaged areas on historical documents, or be used to reinforce entire pages.
Tengujo paper process. KAZUHIRO NOGI/AFP via Getty Images

Because of this delicate size, Yale paper conservator Soyeon Choi called tenjugo "the bread and butter in paper conservation."

Because of this delicate size, Yale paper conservator Soyeon Choi called tenjugo "the bread and butter in paper conservation."
Tengujo paper process. KAZUHIRO NOGI/AFP via Getty Images
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This makes it even thinner than human skin, an accomplishment no other factory has been able to replicate.

This makes it even thinner than human skin, an accomplishment no other factory has been able to replicate.
Tengujo paper process. KAZUHIRO NOGI/AFP via Getty Images

This thinnest paper is only 0.02 mm thick, the width of a single kozo fiber.

This thinnest paper is only 0.02 mm thick, the width of a single kozo fiber.
Tengujo paper process. KAZUHIRO NOGI/AFP via Getty Images
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At this point, the final product is nearly transparent.

At this point, the final product is nearly transparent.
Tengujo paper process. KAZUHIRO NOGI/AFP via Getty Images

The thin fibers are rolled into sheets of paper for delivery.

The thin fibers are rolled into sheets of paper for delivery.
Tengujo paper process. KAZUHIRO NOGI/AFP via Getty Images
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It's essentially the same process that was once done by hand.

It's essentially the same process that was once done by hand.
Tengujo paper process. KAZUHIRO NOGI/AFP via Getty Images

The papermaking machine rocks the material backing and forth, and the fibers become intertwined.

The papermaking machine rocks the material backing and forth, and the fibers become intertwined.
Tengujo paper process. KAZUHIRO NOGI/AFP via Getty Images
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Once the mixture is thick enough, it can go to the papermaking machine.

Once the mixture is thick enough, it can go to the papermaking machine.
Tengujo paper process. KAZUHIRO NOGI/AFP via Getty Images

Neri thickens the solution.

Neri thickens the solution.
Tengujo paper process. KAZUHIRO NOGI/AFP via Getty Images
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Then, fibers are combined in a solution using neri, liquid from the sunset hibiscus plant.

Then, fibers are combined in a solution using neri, liquid from the sunset hibiscus plant.
Tengujo paper process. KAZUHIRO NOGI/AFP via Getty Images

Next comes the time-consuming process of disentangling the kozo.

Next comes the time-consuming process of disentangling the kozo.
Tengujo paper process. KAZUHIRO NOGI/AFP via Getty Images
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This stage takes place over several days, and requires five different workers at five different cleaning stations.

This stage takes place over several days, and requires five different workers at five different cleaning stations.
Tengujo paper process. KAZUHIRO NOGI/AFP via Getty Images

Hiroyoshi Chinzei is a fourth-generation tenjugo maker, and head of the company.

Hiroyoshi Chinzei is a fourth-generation tenjugo maker, and head of the company.
Tengujo paper process. KAZUHIRO NOGI/AFP via Getty Images
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Though the process is now industrialized, workers still remove some impurities by hand.

Though the process is now industrialized, workers still remove some impurities by hand.
Tengujo paper process. KAZUHIRO NOGI/AFP via Getty Images

This part of the process also removes any scratches the plants might have left on each other.

This part of the process also removes any scratches the plants might have left on each other.
Tengujo paper process. KAZUHIRO NOGI/AFP via Getty Images
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Then, steamed kozo plants go into a large water tank for another cleaning.

Then, steamed kozo plants go into a large water tank for another cleaning.
Tengujo paper process. KAZUHIRO NOGI/AFP via Getty Images

Cooking the plant removes materials that connect the fibers, leaving only what will be used in the final product.

Cooking the plant removes materials that connect the fibers, leaving only what will be used in the final product.
Tengujo paper process. KAZUHIRO NOGI/AFP via Getty Images
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Then, the kozo are steamed.

Then, the kozo are steamed.
Tengujo paper process. KAZUHIRO NOGI/AFP via Getty Images

First, workers clean the kozo and remove any dirt or imperfections.

First, workers clean the kozo and remove any dirt or imperfections.
Tengujo paper process. KAZUHIRO NOGI/AFP via Getty Images
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Kozo is bundled to prepare for the process.

Kozo is bundled to prepare for the process.
Tengujo paper process. KAZUHIRO NOGI/AFP via Getty Images

Source: Hidaka Washi

Tenjugo paper is made from kozo, the stems of mulberry plants.

Tenjugo paper is made from kozo, the stems of mulberry plants.
Tengujo paper process. KAZUHIRO NOGI/AFP via Getty Images
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Historically, the paper has been used for sliding doors, lampshades, and room dividers.

Historically, the paper has been used for sliding doors, lampshades, and room dividers.
Tengujo paper process. KAZUHIRO NOGI/AFP via Getty Images

The factory is located about 400 miles southwest of Tokyo.

The factory is located about 400 miles southwest of Tokyo.
Tengujo paper process. KAZUHIRO NOGI/AFP via Getty Images
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