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Society & Culture

Multispectral imaging unlocks a Smithsonian treasure’s secrets

Associate professor of English and textual scientist and his students have been occupied in their multispectral imaging lab for the past few weeks, working to recover the hidden text in a rare Armenian prayer book sent to them by the Smithsonian.

The book鈥攐r codex, as it鈥檚 also known, which means an ancient manuscript in book form鈥攃ontains the text of the prayer book, suspected by Heyworth鈥檚 team to date from the 15th century. But beneath those words lie the remnants of a long-erased other work鈥攚hich might be much older.

The Smithsonian sent the codex to Heyworth and his team because of their expertise and innovation in carrying out . They use different wavelengths of light to painstakingly photograph an object, revealing what the eye cannot see.

The pages of the book are made of parchment, or treated animal hide. Scribes would reuse parchment, literally scraping or bleaching away ink to create blank pages for a new work. Such recycled parchment is called a palimpsest鈥攁nd the ghost of the original text lurks beneath, often through the ink鈥檚 chemical interaction with the surface of the parchment.

When Heyworth and his team have processed the images, a scholar of Armenian will work to decipher the recovered text. And then the Smithsonian should have the answer to a mystery.

IN PHOTOS

(人妻少妇专区 photos / J. Adam Fenster)

close up of the small book from the side, its pages compressed together.

The 聽decided to send this Armenian prayer book to researcher Gregory Heyworth at the 人妻少妇专区 when the head of the Smithsonian鈥檚 special collections department learned of the expertise of the Lazarus Project in deciphering the secrets of cultural heritage objects. The Lazarus Project is a research group led by Heyworth, an associate professor of English and textual science. Much of their work is involves ancient and medieval manuscripts.

 

small ancient book, with someone's fingers holding it open to a handwritten page

The tiny book was acquired by the Smithsonian in 1925. It鈥檚 made up of 147 folios of parchment, or treated animal hide, stitched together. The 鈥渙ver text鈥濃攖he visible text鈥攊s of an Armenian prayer book, suspected to date from the 15th century. But there is also an 鈥渦nder text鈥濃攁 work that was erased to recycle the parchment for the over text. The Smithsonian has turned to the Lazarus Project to help solve the mystery of what that long-ago effaced text might be.

 

two researchers lean over a scanner in a multispectral imaging lab

Heyworth and graduate student Helen Davies prepare the book for multispectral imaging. Photographing the book in different wavelengths of light allows the researchers to capture what the naked eye can鈥檛 see. Heyworth calls it 鈥渇orensic science applied to literature and history.鈥

 

four images side by side of a books scanned with blue light and then scanned with green light as part of the multispectral imaging process.

The lab in Rush Rhees Library flashes with color as the book is exposed to one wavelength of light and then another. The work is exacting, and each side of each page is imaged about 30 times.

 

single handwritten page of an ancient book being held flat on a scanner by wooden knitting needles.

Heyworth and his team have invented much of their gear, creating systems that allow them to work both with efficiency and meticulous care. Sometimes, even in this high-tech lab, the most useful tools are humble ones. Here, wooden knitting needles鈥攍ightweight and non-reflective鈥攑erform the crucial task of holding the open page in place.

 

close-up detail of handwritten writing on a page.

On this page, a glimpse of the under text is visible, running perpendicular to the over text. On most pages of the book, its remains are not so easily discerned.