Science, Tech, Math › Science Spooky Halloween Jack-o-Lantern Dry Ice Fog in a Halloween Jack-o-Lantern Share Flipboard Email Print Dry ice in water produces spooky fog that spills from the carved jack-o-lantern. Anne Helmenstine Science Chemistry Projects & Experiments Basics Chemical Laws Molecules Periodic Table Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. our editorial process Facebook Facebook Twitter Twitter Anne Marie Helmenstine, Ph.D. Updated August 06, 2019 You can make spooky fog come out of your Halloween jack-o-lantern using a little dry ice. Here's how you do it plus a trick for getting the best effect. Spooky Jack-o-Lantern Materials Basically, all you need is a carved jack-o-lantern, dry ice, a container, and water. Warm water is more effective than cool or room temperature water. PumpkinTall cup or glassDry iceWater Let's Get Started! Okay, first you need to cut around the top of the pumpkin so you can scoop out the seeds and other pumpkin guts. If you are rushed for time, you can skip this step, but it's easier to carve a clean pumpkin.Carve a face or design into the pumpkin. Keep in mind, carbon dioxide fog sinks, so more fog will flow out of the mouth of your jack-o-lantern than through its eyes. If you make the mouth relatively small, you usually can get fog to flow through the nose and eyes pretty well.When you are ready for the display, set a tall container full of water inside the jack-o-lantern. Try to find a can or glass that is taller than the eyes of your jack-o-lantern, since that is the trick for getting fog to flow through the whole carving.Drop a piece of dry ice into the water. Replace the top of the pumpkin. You want the lid to fit tightly so there won't be air currents dissipating the fog.You can add more dry ice over time.