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A Japanese ninja history student who handed in a blank paper was given a top mark after her professor realised her essay was written in invisible ink

Mack DeGeurin , Business Insider US
 Oct 11, 2019, 12:42 PM
Invisible ink.
  • A Japanese student handed her professor what appeared to be a blank sheet of paper for her final exam in a ninja history course at Mie University in Japan, the BBC reported.
  • At first, the sheet looked like a piece of trash, but then the professor held it over a hot stove and black ink slowly began to appear. The student, 19-year old Eimi Haga, had written her entire exam in invisible ink.
  • Haga used a traditional Japanese method called aburidashi. The professor was surprised but ultimately gave her full marks for her creativity.
  • For more stories, go to Business Insider SA.

A "ninja history" student at Mie University in Japan shocked her professor when she handed in her final exam.

At first, her submission looked like a blank sheet, but a small note at the top read, "heat the paper." When the professor complied and held the assignment over a heated stove, black text suddenly appeared line by line.

The student, 19-year-old Eimi Haga, had written her entire exam in invisible ink.

As first reported by the BBC, Haga used a traditional Japanese invisible ink method called "aburidashi" to write the essay. Haga created a soybean extract that required her to soak the beans overnight and crush them into a cloth.

After reportedly spending more than two hours fine-tuning the extract's concentration, Haga finally dipped a fine brush into the ink and wrote her essay on a thin traditional Japanese paper called "washi. " Once the ink dried, the letters seemingly disappeared, blending in with the paper's off white hue.

"When the professor said in class that he would give a high mark for creativity, I decided that I would make my essay stand out from others," Haga told the BBC. The first-year student rummaged said she remembered hearing about the invisible ink in an animated TV show she'd watched as a child.

"I just hoped that no-one would come up with the same idea," Haga told the BBC.

Haga's professor, Yuji Yamada, told the BBC he was surprised by Haga's choice but had "little doubt" Haga's words would come out clearly. He decided to give his pupil full marks for her creativity. To keep some of the letters hidden, the professor didn't read the essay to the end.

That may have been for the best, according to Yamada, who told the BBC that the bulk of her focus went toward the ink and that the essay itself was "nothing special."

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