In Japanese history, ninjas were seen as assassins who could infiltrate any castle or building under the cover of darkness and complete the mission without ever being seen. Many consider them the first-ever spies in the world as they would often use unique ways of hiding their correspondence to one another.
Eimi Haga, a ninja history major in Japan, was tasked with writing her term paper on the Ninja Museum of Igaryu. Haga told the BBC: “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.”
Oh, and did she ever make her paper stick out. As previously mentioned, ninjas would often share corresponds with one another but would traditionally use certain methods to conceal their writings.
As if she were imagining the enemy deciphering her paper, Haga decided she would write the paper in invisible ink.
“To tell the truth, I had a little doubt that the words would come out clearly,” she said. “But when I actually heated the paper over the gas stove in my house, the words appeared very clearly and I thought ‘Well done!'”
Surprisingly, it didn’t take her too long to create her invisibly worded paper. To complete this task, the 19-year-old soaked soybeans overnight. Once dry, she would crush them into powder. According to Upworthy, the teen spent hours concocting her idea and getting the ink to dry just right where it would be impossible to read unless you brought a heat source close to the page.
When it came time to turn in her work, Haga submitted her paper with the caption next to it reading: “Heat the paper.”
When he was grading the papers, Haga’s professor was amazed at the fact that one of his students went through the hassle of creating invisible ink. He even shared it with the class in the hopes of inspiring others.
“I didn’t hesitate to give the report full marks – even though I didn’t read it to the very end because I thought I should leave some part of the paper unheated, in case the media would somehow find this and take a picture.”
That’s how you get an A+.