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A Japanese pupil of ninja history who handed in a paper that is blank offered top marks – after her teacher realised the essay ended up being written in hidden ink.
Eimi Haga implemented the ninja technique of “aburidashi”, spending countless hours soaking and crushing soybeans to make the ink.
The language showed up when her teacher heated the paper over his gasoline kitchen stove.
“It is something we discovered through a novel once I was small,” Ms Haga told the BBC. “we just hoped that no-one would show up with the exact same idea.”
Ms Haga was thinking about ninjas – covert agents and assassins in medieval Japan – since watching an animated TV show as a young child. Continue reading “Japan ninja student gets top marks for composing essay in hidden ink”