🕵️♀️ Spooky science secrets! Want to send a hidden Halloween message? Try this Invisible Ink experiment using phenolphthalein solution, Windex, and a cotton swab—it’s like magic!
➡ Swipe for the steps and tag #GSRVSTEM to show off your ghostly creations.
👻 Bonus: You can also use lemon juice and heat for a classic invisible ink trick!
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