Diy Invisible Ink Pen For Secret Messages. You can use both the lemon juice and the baking soda in the same drawing if you like. The message discolors before the rest of the paper gets hot enough to do so.
Exciting spy activities for kids: Dip a cotton swab into the lemon juice mixture and write a message on a piece of white paper. If you want to do this with any old marker, do this, but wash out all the ink.
Hey kids, ever wonder how you can make your over own invisible ink or write glow in the dark messages?
If you want to do this with any old marker, do this, but wash out all the ink. Keep your creative kids entertained for hours with this fun diy invisible ink recipe that uses. When you are ready to read your invisible message, hold the paper up to sunlight, a light bulb (recommended), or another heat source. The message discolors before the rest of the paper gets hot enough to do so.