> Inkt

2015c Dambrogio, Akkerman, Mauer
J. Dambrogio, N. Akkerman, E. Mauer, et al, Invisible Ink: Artichoke Juice, Invisible Ink --a Witchcraft Potion? (1656) =Spies and secrets: Artichoke Juice, Invisible Ink --a Witchcraft Potion? (1656), Letterlocking Instructional Videos, Massachusetts Institute of Technology (MIT), filmed 2015 mei, posted 2015 nov 07
https://youtu.be/-Rmj0kvsCZU (video 2:57)


2015b Dambrogio, Akkerman, Mauer
J. Dambrogio, N. Akkerman, E. Mauer, et al., Spies and secrets: Alum Invisible Ink (1600s), Letterlocking Instructional Videos, Massachusetts Institute of Technology (MIT), filmed 2015 mei, posted 2015 nov 07
https://youtu.be/d1mw_bhEvFg (video 7:18)


2015a Dambrogio, Akkerman, Mauer
J. Dambrogio, N. Akkerman, E. Mauer, et al., Spies and secrets: Gall Invisible Ink (reveal: Copper II Sulfate or Iron II Sulfate) (1657), Letterlocking Instructional Videos, Massachusetts Institute of Technology (MIT), filmed 2015 mei, posted 2016 nov 06
https://youtu.be/ipXylYEzdMM (video 4:01)