This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these messages)
|
Aburidashi is a ninja technique of sending secret messages using a form of invisible ink.[1] The technique uses ink made of juice extracted from soaked and crushed soybeans.[1] The message becomes visible to the recipient by heating the paper.
References
edit- ^ a b "Japan ninja student gets top marks for writing essay in invisible ink". BBC News. 10 October 2019. Retrieved 2019-10-10.
 | This article related to the culture of Japan is a stub. You can help Wikipedia by expanding it. |