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secret egg writing! 

"using a special ink that he made with vegetable pigments and alum (an aluminum sulfate that crystallizes in water and serves as a fixative) Della Porta would write on the shell, which, being semi-porous, would allow the ink to penetrate. Once it dried, the egg was boiled and the hot water erased the writing on the outside but not on the inside, so that the prisoner could break the shell and read the message printed on the white."

labrujulaverde.com/en/2020/08/

secret egg writing! 

ok this guy also published plays, was a pioneer of mycology, and was "the first person to attack in print, on experimental grounds, the ancient assertion that garlic could disempower magnets"

secret egg writing! 

@ranjit >secret egg writing!
So my diary?

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