Studentin Eimi Haga aus Japan hat eine Studienarbeit über Ninja-Geschichte in unsichtbarer Tinte geschrieben, die sie nach der traditionellen Ninja-Technik Aburidashi aus gemahlenen Sojabohnen und Wasser hergestellt hatte. Für die Arbeit gab’s selbstverständlich und völlig verdient eine 1. Bravo!
A Japanese student of ninja history who handed in a blank paper was given top marks – after her professor realised the essay was written in invisible ink. Eimi Haga followed the ninja technique of “aburidashi”, spending hours soaking and crushing soybeans to make the ink. The words appeared when her professor heated the paper over his gas stove. […]
Ms Haga, 19, soaked soybeans overnight, then crushed them before squeezing them in a cloth. She then mixed the soybean extract with water – spending two hours to get the concentration right – before writing her essay with a fine brush on “washi” (thin Japanese paper).
Once her words had dried, they became invisible. But, to ensure her professor didn’t put the essay in the bin, she left a note in normal ink saying “heat the paper”.
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