Subject: What does one use to make invisible ink, which, when heated, turns red?
Date: Sat Mar 6 19:42:47 1999
Posted by Daijo Kaneshiro
Grade level: nonaligned
School: Curious father, librarian
City: Waimanalo State/Province: HI
Area of science: Other
I've done searching on the internet, your archives and library
using the following terms: invisible, ink, red, heat*; and
submitted the question to the Internet Public Library. I've
tried milk and lemon juice, but when the paper is heated, the
color is brownish. I'm looking for something that will turn red
on paper after it's heated. Thanks having a site like this one.
Re: What does one use to make invisible ink, which, when heated, turns red?
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