Invisible ink recipes

[FredRydr]

https://www.cia.gov/library/readingroom/collection/secret-writing

Fred

[Vespagirl]

This looks like way too much fun!


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[jbb]

This is fascinating! Thanks for posting it! Of course in this day and age using your best cursive is as good as invisible writing since only the "few" can still read it. :)

[Scooby921]

I think it would be fun to try and create one of these, but for those without the desire to mix chemicals you can buy Noodler's Blue Ghost off the shelf. UV responsive, but otherwise invisible. It's just wet enough while writing that you can see the reflection of light off the ink so you can see what is going down on the page. I bought it just for fun. I haven't gotten much of any use out of it, but I gave a sample to Sammyo and he had fun making secret pirate treasure maps for his daughter.