Creepy Shrunken Heads: A Halloween Science Experiment with Apples

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Looking for a spooky science activity that’s perfect for Halloween? This Shrunken Heads Halloween Science Experiment is the ultimate combination of creepy and educational! With just a few simple supplies (and a little patience), your kids can make their own apple shrunken heads—a perfectly gross and fascinating Halloween project.

This is a hands-on way to explore dehydration, preservation, and the science of decay. Plus, it’s just plain fun to watch those little faces shrivel up into ghoulish grins!

What Are Shrunken Heads?

Traditionally, shrunken heads come from various cultural practices, but don’t worry—ours are 100% kid-friendly and made from apples! Over time, carved apples naturally lose moisture and shrivel up, creating an eerie, aged look that’s perfect for Halloween decorations.

What Kids Will Learn:

• The science of dehydration and how water leaves fruit

• How preservation methods (salt + acid) slow down decay

• Artistic expression through carving faces

• Observation and patience as the heads transform over time

Supplies Needed:

• Apples (1 per head)

• Paring knife (adult supervision required)

• Large bowl of water

• 2 Tbsp lemon juice

• ½ cup salt

• Oven

• Jumbo paper clips

• String

How to Make Apple Shrunken Heads

1. Peel the Apples

Start by peeling your apples completely. Choose apples that are firm and not too small for easier carving.

2. Carve Faces

Use a small paring knife to carve spooky or silly faces into the peeled apples. The deeper and more detailed the cuts, the more defined the features will look once shriveled. My boys made a couple—mine’s the creepy one in the middle!

3. Soak in Preserving Solution

Fill a bowl with water, lemon juice, and salt. Soak the carved apples for 24 hours. This step helps preserve them and prevents excessive browning or mold growth.

4. Bake the Apples

Preheat your oven to 200°F (93°C). Bake the apples for about 3 hours, flipping halfway through. This speeds up the dehydration process and helps set the faces.

5. Hang and Shrivel

Let the apples cool. Then insert a partially straightened jumbo paper clip through the top and bend the end to secure it in place. Tie a string to the top and hang the apples in a cool, dry place for 1–2 weeks. Check them every few days and watch them transform into creepy little heads!

Science Behind It:

As the apples hang, water slowly evaporates from the fruit, causing the apple to shrink and the carved features to become exaggerated. The lemon juice (acid) and salt work together to preserve the fruit and prevent rot or mold while it dries. It’s a fun way to learn about natural preservation and water content in fruit!

Extend the Learning:

• Track the changes by taking daily or weekly photos.

• Weigh the apples before and after drying to calculate how much water was lost.

• Compare apples hung in different locations (sunny window, dark closet, humid vs. dry) to see how environment affects drying.

• Try this with other fruits like pears or even potatoes for comparison.

A (Very Brief) History of Shrunken Heads

Shrunken heads, or tsantsas, have roots in the cultural traditions of the Shuar people of the Amazon rainforest in Ecuador and Peru. These heads were made by removing and shrinking human heads as part of a ceremonial practice that was deeply spiritual and symbolic. It was believed to trap the spirit of an enemy and protect the tribe from harm.

Over time, these artifacts became misunderstood and sensationalized in Western culture, especially during the 19th and early 20th centuries, when they were collected and even sold illegally. Because of this, museums and historians now approach this subject with much more cultural sensitivity and care.

The shrunken heads we make with apples are just a lighthearted and educational Halloween twist on the concept—no actual heads involved, of course! It’s a way to explore both science and world history in a fun (and slightly spooky) seasonal activity.

Add More Halloween STEAM Fun!

Love this project? Pair it with more of our spooky STEM and STEAM ideas:

Gross Halloween Party Food

Halloween STEM: Flapping Bat Wings

Halloween STEM~ Paper Circuits

Check out our Halloween STEAM Kids Halloween STEAM Kids book!

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