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Found a notebook in a library book with a recipe for 'invisible ink'
I mean, it was just a regular composition book tucked in a cookbook at the local branch. The page said to mix lemon juice with a little water and write with a toothpick, then heat the paper to reveal it. I tried it on some printer paper and held it over my stove. Instead of neat writing, the whole sheet just turned a gross brown and curled up. Maybe my heat was too high? Has anyone else actually gotten one of these old tricks to work without ruining the paper?
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charles_lewis146mo ago
Oh man, I read you need a super low heat like a light bulb.
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charles_green6mo ago
Yeah, that "super low heat" thing is way off... A light bulb won't cut it for most stuff. You need a steady, even warmth, not just a tiny hot spot. Trust me, @charles_lewis14, that advice will leave you cold in a bad way. Seen it happen too many times. Gotta have a proper heat source.
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emery185mo ago
Right? What are people even thinking with the light bulb idea. I tried that once for seedlings and they got all leggy and weak because the heat was so uneven. You really do need something that spreads the warmth out.
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