Wit’s Interpreter, published in London in 1655, includes a section on
forming ciphers and making invisible ink.
A new exhibit at the Folger Shakespeare Library in Washington, D.C., offers a
glimpse at correspondences four centuries old. "Letter Writing in Renaissance
England," which runs through April 2005, includes letters penned in invisible
ink, sealed in wax and embroidery silk, and sent to and from some of the most
famous figures in history.
NPR’s "All Things Considered"
Provided by: Folger Shakespeare
Happy Birthday Carsten Perthel, December 15