To read the message, expose the paper to heat from the back. Use a heat source to decode the secret message. Mislead your enemies with a decoy message. If you want to mislead anybody who might suspect there’s a secret message on the paper, write something else on the page with a regular pencil. Submerge the tip of a cotton swab in the lemon-water solution, and use it to write your secret message on some paper.ĥ. If you get some seeds, don’t worry about them.ģ. You can use your hands or, if you have any unhealed scratches, a juicier. Squeeze the lemon juice into the small container. Instructions If you just gave yourself a manicure, I’d suggest you use a juicier. We also recommend having a fire extinguisher close at hand just in case. To avoid any injuries, make sure you or another adult are in charge of either handling or supervising the use of heat. Teach your kids this simple trick and you can even reclaim a little privacy around the house by leaving secret notes for each other.īut before you start, an important warning: This project involves a heat source. You can use milk, too, but the science behind it is not the same. Real-life spies have employed more analog methods-writing invisible messages with acidic liquids such as lemon juice is one of them. They always seem to possess some amazing, technological gadget that ultimately helps them dismantle an atomic bomb, save the queen, or stop the assassination of the Malaysian prime minister.īut espionage techniques don’t have to depend on such intricate devices. Show us how it went by tagging your project on social media using #popsciprojects. On weekdays at noon, we’ll be posting new projects that use ingredients you can buy at the grocery store. Welcome to PopSci’s at-home science projects series.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |