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Top Halloween Chemistry Projects

Spooky Halloween Chemistry


A little chemistry can add a lot of ghastly, ghostly effect to your Halloween celebration. Here's a look at some of the top Halloween projects you can do that apply your command of chemistry. The best part? You don't even need to be a chemist. These Halloween projects involve everyday chemistry that anyone can do!

Glow in the Dark Pumpkin

This spooky Halloween pumpkin glows in the dark.
Anne Helmenstine
You don't need a knife or a candle to create this eerie jack-o-lantern face. It's surprisingly quick and easy to make a phosphorescent pumpkin for Halloween.

Make Fake Blood

Fake blood (stage blood) is great for theatrical productions and Halloween.
Win Initiative, Getty Images
I think we can all agree it's best to use fake blood for your Halloween celebration. Of course, you can buy fake blood, but if you make your own you can control the exact color and consistency (plus it's simply fun to make fake blood).

Dry Ice Fog

Dry Ice Fog
Shawn Henning
There are a few different ways to create creepy Halloween fog. Dry ice fog is nice because it's non-toxic, doesn't have a weird chemical smell (like smoke machine juice), and billows out tons of fog that naturally sinks to the floor.

Glowing Hand of Doom Punch

This festive punch has a glowing hand and gives off lots of fog.
Anne Helmenstine
If floating a candy eyeball in a punchbowl is a little too tame for you, try making Glowing Hand of Doom punch. This punch is fizzy, glows, and produces fog. What more could you ask for? It even tastes good!

Green Fire Jack-o-Lantern

This Halloween jack-o-lantern is filled with green fire.
Anne Helmenstine
Putting a tealight in a jack-o-lantern produces a nice, cheery glow. If you really want to scare away the evil spirits, don't you think a burst of green fire would work better? I thought so, too.

Turn Water into Blood

Water into Wine or Blood Demonstration
andrea, www.morguefile.com
... and then back into water. This is a classic color-change chemistry demonstration that you can use as a holiday pH indicator demonstration or as a really cool effect at a Halloween party... or both.

Dry Ice Crystal Ball

This is a dry ice bubble.
Anne Helmenstine
A real crystal ball is pretty cool, but I would argue this dry ice crystal ball is even cooler because (a) it's literally icy cold and (b) it contains swirling whorls of fog, which you just don't see in a real crystal ball unless maybe you're psychic. You could make the effect even more spectacular by placing a small LED light into the container.

Make Ectoplasm

You can make this non-sticky, edible slime from two easy-to-find ingredients.
Anne Helmenstine
Ectoplasm is that goo left behind when ghosts interact with the realm of the living. This stuff is relatively non-sticky, so feel free to decorate yourself with it, your home... you get the idea.

Dry Ice Ghastly Jack-o-Lantern

I put a cup of water inside this Halloween jack-o-lantern and dropped in a piece of dry ice.
Anne Helmenstine
If you stuff your jack-o-lantern with smoldering leaves, I am sure it will produce a lot of attractive smoke. However, it will smell like fire and I think most people will assume you are using a defective candle rather than trying to achieve a spooky effect. On the other hand, filling your pumpkin with dry ice fog will be eerie and spooky.

Fake Blue or Green Blood

You can make use this edible fake blue blood for insects, spiders, crustaceans, and maybe aliens.
Anne Helmenstine
Humans have red blood, but many other creatures don't! If your Halloween theme involves spiders or perhaps aliens, you might want to try this edible blue or green blood recipe.

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