Eimi Haga, a Japanese student of ninja history, handed in a white paper, but she got top marks — after her teacher realized she wrote the essay in invisible ink.
She followed the ninja technique of "aburidashi", and she spent hours doing with soybeans to make the ink.
The words appeared when her teacher heated the paper over his gas stove.
“I learned something through a book when I was little,” Haga said. “I just hoped that no one would come up with the same idea.”
The teacher, Yuji Yamada, said he was “surprised” when he saw the essay. “I saw someone write such reports in code, but never saw one in aburidashi,” he said.
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