How To Add Paint To Oobleck: 8 Steps To Colorful Slime

Oobleck can provide you with hours of fun. There are so many variations that you can make, such as, Oobleck slime, rainbow Oobleck, fluffy Oobleck (containing shaving cream), stretchy Oobleck (containing dishwashing liquid), super-slimy Oobleck (containing PVA (polyvinyl alcohol) and borax), magnetic Oobleck (containing iron oxide powder), and even glow-in-the-dark Oobleck (containing tonic water or neon/fluorescent paint). But what would happen if you were to add regular paint to your Oobleck? Will it work? Well, since people add all sorts of things to Oobleck, it should come as no surprise that it is possible, and here is how:

How To Add Paint To Oobleck In 8 Steps

  • Cover work surface with newspaper.
  • Add 1½ cups cornstarch into mixing bowl.
  • Add 1 cup water.
  • Mix thoroughly.
  • Divide Oobleck into muffin pan.
  • Add tempera paint into muffin cups (different colors).
  • Mix thoroughly.
  • Store in zip-lock freezer bags.

Tempera paint is not the only type of paint that you can add to Oobleck. There are other coloring methods you can experiment with, and this article will cover them all. So, come and join me, and let’s go and have some colorful fun!

What Is Oobleck, And How Does It Work?

Before we start, let me briefly explain what Oobleck is. Oobleck is a non-Newtonian fluid, which means it does not have a constant viscosity. If pressure or force is applied to this suspension/substance, it will mimic a solid’s characteristics and become very dense. Once the pressure is relieved, it turns back into a liquid state.

Other examples of non-Newtonian fluids are;

  • Melted butter
  • Ketchup
  • Custard
  • Blood
  • Silly putty
  • Plant resin
  • Toothpaste
  • Quicksand
  • Honey
  • Mayonaise
  • Flubber (polyvinyl alcohol and borax)

How To Add Paint To Oobleck In 8 Steps

Today I will show you how to add tempera paint to Oobleck in 8 easy steps. It is so simple yet so fun to make.

What You Need

  • 1½ Cups (375ml) of cornstarch
  • 1 cup (250ml) of water
  • Tempera paint (various colors)
  • A mixing bowl
  • A mixing spoon
  • Measuring cup/jug
  • Muffin pan
  • Newspaper
  • Ziplock freezer bags (one for each color)


  1. Cover your entire work surface with newspaper, even on the floor underneath if you want.
  2. Measure 1½ cups of cornstarch and pour it into a mixing bowl.
  3. Measure 1 cup of water and add it to the cornstarch.
  4. Using a mixing spoon, mix the water and cornstarch thoroughly, adding more cornstarch if the mixture is too runny, and more water if the consistency is too stiff.
  5. Divide the Oobleck evenly into the muffin pan.
  6. Select the colors of paint that you want to add to the Oobleck, and add a few drops into each cup (a different color for each batch.
  7. Mix each of the batches gently but thoroughly until the colors are evenly distributed throughout the Oobleck.
  8. Once you are done mixing your Oobleck, transfer each color into a separate freezer bag and seal it tightly. This allows you to play with one color at a time, or you can play with all of the colors together if you prefer.

Let’s Add Some Fun Stuff! *Optional

There are many things that you can add to y our Oobleck to make the experiment even more exciting, such as;

  • Marbles (a sensory experience)
  • Glitter
  • Confetti
  • Small objects that the kids must find, feel and guess what it is

See how easy that was? Well, let’s continue having fun by trying all the various kinds of color you can add to your Oobleck!

How To Make Glow-In-The-Dark Oobleck?

This recipe is a personal favorite of mine because it looks so beautiful and magical!

What You Need

  • 2 cups (500ml) of cornstarch
  • 1 cup (250ml) of Tonic Water
  • 1 Tube of fluorescent (or neon) or glow-in-the-dark paint
  • A mixing bowl
  • A mixing spoon
  • Measuring cup/jug
  • A blacklight
  • Newspaper


  1. Cover your entire work surface with newspaper, even on the floor underneath if you want.
  2. Measure 2 cups of cornstarch and pour it into a mixing bowl.
  3. Measure ½ cup of tonic water, add it to the cornstarch and mix well.
  4. Mix the other ½ cup of tonic water into the mixture, one spoonful at a time. Stir well.
  5. Add the glow-in-the-dark or fluorescent paint to the cornstarch and tonic water mixture (little by little) and stir gently until the paint is evenly distributed throughout the entire batch.
  6. If you used glow-in-the-dark paint, place the Oobleck in sunlight or next to a lamp to charge.
  7. If you used fluorescent paint, normal light wouldn’t do the trick. You need a black light to make it glow. Place the Oobleck in a dark room and switch on your black light to make it glow.

*You can also use a black light with glow-in-the-dark paint to make it glow more intensely.

What’s The Science Behind It?


Glow-in-the-dark paint glows due to a process called luminescence. It is caused by luminescent phosphors that are present in the paint. To glow, you need to charge it in sunlight or under a light.

After it has charged for 30 minutes, you must place it in a dark room, and you will see it light up. The brightness will start to fade slowly, and eventually, you will have to recharge it.

Fluorescent/Neon Paint

Fluorescent or neon paint glows when it is exposed to long-wave, ultraviolet radiation. The chemicals in fluorescent and neon paints absorb invisible radiation and then emit a longer wavelength of visible light of a specific color.

Therefore, fluorescent or neon paint requires a UV light (also known as a black light) that does not emit too much visible light.

How To Add Color To Oobleck Slime

You can add a powder pigment to Oobleck slime. This recipe does not require any cornstarch, and instead of being a solid color, Oobleck slime is see-through.

What You Need

  • Glow-in-the-dark powder pigment
  • 1 cup (250ml) liquid starch
  • 1 cup (250ml) Clear glue (washable)
  • Glitter (optional)
  • Measuring cup/jug
  • A plastic container with a lid


  1. 1.Measure 1 cup of liquid starch and pour it into the plastic container. Close the container and shake well before you add the glue.
  2. Measure 1 cup of clear glue, add it to the liquid starch, and use your fingers to mix the Oobleck.
  3. Stretch and pull the slime and add the glow-in-the-dark pigment as you work with it.

Your slime will be transparent, and when you go into a dark room and turn on a blacklight, it will light up like the night sky.

How To Add Color To Classic Oobleck

The original Oobleck recipe remains one of the best! After all, this is how it all started. And it sparked an endless list of slimy experiments and countless hours of fun! Let’s see how we can add color to the original Oobleck.

What You Need

  • 2 cups (500ml) of cornstarch
  • 1 cup (250ml) of water
  • Watercolor paint or food coloring
  • Measuring cup/jug
  • A mixing bowl
  • A mixing spoon


  1. Measure 2 cups of cornstarch and pour it into a mixing bowl.
  2. Measure 1 cup of water and add it to the cornstarch and mix well. If the consistency is too runny, add some more cornstarch, and if it is too stiff, add some more water.

*If you are using watercolor paint, prepare the water before adding it to the cornstarch.

*If you are using food coloring, add a few drops to your Oobleck mixture.

How To Add Highlighter Fluid To Oobleck

This is another glow-in-the-dark Oobleck. This version is made by using the neon fluid inside of a highlighter

What You Need

  • 1½ Cups (250ml) of cornstarch
  • 1 cup (125ml) of water
  • A highlighter (any color)
  • Measuring cup/jug
  • A mixing bowl
  • A mixing spoon
  • A blacklight
  • A jar


  1. Measure 1 cup of water and pour it into your jar.
  2. Remove the highlighter ink rod and place it in the jar of water. Stir gently.
  3. Leave overnight.
  4. The following day, measure 1½ cups of cornstarch and pour it into a mixing bowl.
  5. Add half of the highlighter water (little by little) until you reach a consistency that you are satisfied with.
  6. Go into a dark room, turn on your black light and watch it light up. It’s magical!

Additional Ways To Add Color To Oobleck

Adding paint to Oobleck is great for kids. Not only are they learning about colors, but let’s face it, colorful Oobleck is much more exciting to make!

Even though there is a limited number of the types of paint you can add to Oobleck, there are other ways to add color, such as;

Colored Pigments

These colors come from thermochromic pigments, and it changes colors with temperature. So, if you place it under a lamp to heat up, you will see how it changes color and as it cools down again, it returns to its original color.

Eye Shadow

With so many beautiful metallic shades out there, who wouldn’t want to add it to their Oobleck? Although it won’t change color when it’s heated, it is almost the same as colored pigments.

Permanent Markers

If you remove the felt cartridge from a permanent marker, you can squeeze the fluid directly into your Oobleck. Make sure you wear gloves while you do this; otherwise, you will struggle to get the ink off your hands.

This recipe requires a mixture of ½ cup (125ml) of white or clear glue and ½ cup of water. When you have mixed it well, add the permanent marker ink and continue mixing. Keep adding more ink until you are happy with the color.

Glitter Glue

Instead of plain white or clear glue to make your Oobleck, use Elmer’s colored glitter glue. The glitter glue substitutes the glue and the paint you would have used and thus works as a 2-in-1.


Not only does Kool-Aid color your Oobleck, but it also makes it smell sweet and delicious. All you need to do is add the Kool-Aid to the water before adding it to the cornstarch.

You can also freeze the Kool-Aid in ice trays and once they have iced, place a few blocks with the cornstarch. It looks really interesting when it melts and starts to combine with the cornstarch.

Safety Precautions And Tips

  • UV light can cause cancer, cataracts, and macular degeneration.
  • Whenever you are working with UV light, make sure you wear appropriate safety glasses.
  • Look for “Ultraviolet Radiation Blocking” safety glasses. They are inexpensive and easy to find. Most hardware stores stock UV safety glasses.
  • Let your children use a UV face shield if the glasses are too big for them.
  • Do not dispose of your Oobleck down the drain. It is a suspension, and when the water separates from the cornstarch, it will form a clog and block your pipes. Place it in a plastic bag and throw it in the trash instead.
  • To remove permanent marker ink from your skin, you can use baby oil, whitening toothpaste, coconut oil, olive oil, rubbing alcohol, nail polish remover (acetone), hand sanitizer, or makeup remover.
  • To remove food coloring Oobleck stains from clothing, use white vinegar and warm water.


As you can see, there are various paints you can use to color your Oobleck, even slimy Oobleck. The important thing is to get your ratios right and make sure the paint you are adding is water-based and not solvent-based. As we all know, water and oil do not mix.

Now that you know all the secrets to cool, colorful Oobleck, you can invite your friends and teach them a thing or two. I can assure you; they will be very impressed.

Time to start experimenting, off to the lab!


How To Make Colored Oobleck Science Art Sensory Play (

Glow in the Dark Oobleck : 8 Steps (with Pictures) – Instructables

Creative painting with Oobleck that’s messy fun for kids – Twitchetts

How to Make Oobleck (A Surprisingly Fun Science Experiment) – Simplify Encourage Inspire (

How to Make Oobleck: 8 Steps (with Pictures) – wikiHow

How to Make Glowing Oobleck – Super Science Girl – Exciting Science Learning Adventures for School and Home

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