How to Make Cornstarch Chunks : A Step-by-Step Guide

(Last Updated On: July 8, 2023)

Are you looking to add some excitement to your sensory play or create a unique science experiment? Making cornstarch chunks is a fun and engaging activity that both kids and adults can enjoy. These squishy, moldable chunks are not only entertaining but also provide a tactile and educational experience. In this comprehensive guide, we will guide you through the process of making cornstarch chunks step by step.


Cornstarch chunks are a fascinating substance that behaves like both a solid and a liquid. When pressure is applied, they become firm and solid, but they turn into a flowing liquid when left undisturbed. This unique property makes them an ideal material for sensory play and scientific exploration.

Cornstarch Chunks

Understanding the Science behind Cornstarch Chunks

The science behind cornstarch chunks is based on a phenomenon called shear thickening. Cornstarch, when mixed with water, forms a suspension of tiny starch particles. When pressure is applied, the particles get compressed, resulting in increased viscosity. This increase in viscosity allows the cornstarch chunks to retain their shape when squeezed. As soon as the pressure is released, the particles move apart, and the mixture returns to its liquid state.

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Materials and Ingredients Required

To make cornstarch chunks, you will need the following materials and ingredients:

  • Cornstarch
  • Water
  • Mixing bowl
  • Spoon or whisk
  • Food coloring (optional)
  • Scented oil or essence (optional)
  • Plastic storage container

Step-by-Step Guide to Making Cornstarch Chunks

Cornstarch Chunks

1. Mixing the Cornstarch and Water

  1. Start by taking a mixing bowl and add 2 cups of cornstarch.
  2. Slowly pour 1 cup of water into the bowl.
  3. Mix the cornstarch with water properly until a smooth consistency is achieved.
  4. You can adjust the amount of water or cornstarch to achieve the desired consistency.

2. Adding Color and Scent (Optional)

  1. If you want to add color to your cornstarch chunks, add a few drops of food coloring to the mixture.
  2. To add a pleasant scent, you can mix in a few drops of scented oil or essence. This step is entirely optional and can be skipped if desired.

3. Adjusting the Consistency

  1. Observe the consistency of the mixture. If it is too runny, add more cornstarch. And if the cornstarch mixture is too hard or thick, you can include some water in it.
  2. Keep adjusting the proportions until you achieve a consistency that is moldable and squishy.

4. Moldable and Squishy Chunks Formation

  1. Once you have obtained the desired consistency, take a handful of the mixture and squeeze it together.
  2. You will notice that it forms a chunk that is solid yet malleable.
  3. Experiment with different shapes and sizes by molding the mixture with your hands.
  4. Continue making more chunks until you have used up all the mixture.

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Exploring the Properties of Cornstarch Chunks

1. Sensory Play

Cornstarch chunks provide a fantastic sensory play experience. Children can squish, mold, and manipulate the chunks, stimulating their senses and enhancing their motor skills. The unique texture and consistency of the chunks offer a tactile and interactive playtime activity.

2. Non-Newtonian Fluid

Cornstarch chunks are an example of a non-Newtonian fluid. They exhibit properties of both liquids and solids, depending on the applied force. This characteristic makes them a popular subject for scientific experiments and demonstrations. You can explore concepts such as viscosity, shear stress, and fluid dynamics using cornstarch chunks.

Safety Precautions (Cornstarch Chunks)

While making and playing with cornstarch chunks is generally safe, it’s essential to take a few precautions:

  • Protect the working area with a plastic sheet or newspaper as the mixture can get messy.
  • Avoid inhaling the cornstarch powder as it may cause respiratory irritation.
  • If you feel any skin irritation, wash the affected area slowly with normal water and soap.
  • Cornstarch chunks are not edible and should not be ingested.

Storage and Maintenance Tips

To preserve the longevity of your cornstarch chunks, follow these tips:

  • Store the chunks in an airtight plastic container or zip-lock bag.
  • Keep the container in a cool and dry place to prevent the mixture from drying out.
  • If the chunks become dry, add a few drops of water and knead them to regain the desired consistency.

Conclusion (Cornstarch Chunks)

Making cornstarch chunks is an enjoyable and educational activity that allows you to explore the fascinating properties of non-Newtonian fluids. Whether you use them for sensory play or scientific experiments, these moldable and squishy chunks are sure to provide hours of entertainment. Remember to follow the safety precautions and properly store the chunks for future use.

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  1. Q: Can I use cornflour instead of cornstarch?
    • A: Yes, cornflour is the same as cornstarch and can be used also interchangeably in this process.
  2. Q: Is it safe for toddlers to play with cornstarch chunks?
    • A: While cornstarch chunks are generally safe, supervision is also advised when young children are playing with them to prevent ingestion.
  3. Q: How long can I store the cornstarch chunks?
    • A: When stored properly in an airtight container, cornstarch chunks can last for several weeks.
  4. Q: Can I reuse the cornstarch mixture?
    • A: Yes, you can also reuse the cornstarch mixture multiple times by adding a small amount of water and kneading it to regain the desired consistency.
  5. Q: Are cornstarch chunks biodegradable?
    • A: Yes, cornstarch is a biodegradable substance, making the chunks an eco-friendly sensory play option.

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In this comprehensive guide, we have explored the step-by-step process of making cornstarch chunks. From understanding the science behind their unique properties to providing safety tips and storage advice, you now have all the information you need to create these fascinating sensory play materials. So go ahead, get creative, and enjoy the tactile experience of cornstarch chunks!

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