Invisible Ink (EXP)

During the American Revolution, you are in charge of uncovering a message written in invisible ink.

A letter from Benjamin Thompson to an Unidentified Recipient, May 6, 1775. University of Michigan, Clements Library.

Problem written by: Stephanie Leighton, Taras Skotar, Yu-Sheng Chang, and LiXuan Wong

Curriculum items covered: Acid-base reactions, redox reactions, WHMIS.

Download the full problem here.