Hey, my book on Invisibility got reviewed by the New York Times! I wrote a short blog post with a link to it. https://skullsinthestars.com/2023/04/17/invisibility-reviewed-by-the-new-york-times/
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Was it written in invisible ink, now that is an idea, a print cartridge that contains invisible ink, you could then write documents on a computer, print only the text would not be readable until you say breath on the paper or similar.
