How to Make Baking Soda Slime (Easy Recipe for Kids)

It starts out simple.

Just a few ingredients in a bowl.

But once the baking soda goes in
and the contact solution is mixed—

it comes together fast.

It thickens.
Pulls in on itself.
Starts to stretch and lift from the sides.

And suddenly—

it’s not just a mixture anymore.

It’s something kids reach for—and don’t put down.

And then you see it—right as it starts to come together.

Child stretching glossy purple baking soda slime with glitter showing smooth stretchy texture in a close-up on a white background

They poke it.
Stretch it.
Watch how it moves—

and then they start testing it.

What happens if they add more?
Does the texture change?
Can they make it stretch further?

This baking soda slime recipe takes a familiar slime base and shifts it into something more interactive—something kids don’t just play with, but experiment with.

👉 If you’re exploring baking soda slime and simple reactions, take a look at our baking soda activities hub—it brings together slime, fizzy experiments, and sensory play all in one place.

Using just a few simple ingredients, this becomes a stretchy, sensory-rich activity that invites kids to explore texture, cause and effect, and small changes over time.

🧾 Supplies for Baking Soda Slime

You only need a few simple materials:

1 cup school glue (Elmer’s recommended)
1 tablespoon baking soda
2 tablespoons contact lens solution (must contain boric acid)

Optional:

Food coloring
Glitter
Essential oils (for scent)

baking soda slime supplies on a clean white background with glue, baking soda, contact solution, rainbow food coloring bottles, glitter, and essential oil arranged in a bright flat lay

🥣 How to Make Baking Soda Slime

Step 1: Start the Base

Pour the glue into a bowl.

At this stage, it still looks simple—nothing unusual yet.

Step 2: Add Color + Texture

Mix in food coloring, glitter, or scent if you’re using them.

This is where kids begin to engage—watching the mixture shift before it becomes slime.

Step-by-step baking soda slime process showing glue, glitter, activator being added, and slime forming in a clear bowl on a white background

Step 3: Add Baking Soda

Stir in the baking soda until fully combined.

You’ll notice a slight change in texture—subtle, but important.

Step 4: Activate the Slime

Slowly add contact solution in small amounts, mixing as you go.

Within seconds, it starts to pull together.

This is the moment everything changes.

Child stirring baking soda slime as it thickens and pulls together into glossy purple glitter slime in a clear bowl on a white background

👉 If your kids love fast transformations like this, try a sound volcano next—it builds quickly and adds a whole new sensory layer to the same kind of reaction.

Step 5: Mix + Knead

At first, it will be sticky.

That’s part of the process.

Keep mixing, then knead with your hands until it becomes smooth and stretchy.

child’s hands kneading baking soda slime on a white surface showing pressing, folding, and stretching as the purple glitter slime becomes smooth and stretchy

🌈 What Makes This Different

This isn’t just about making slime.

It’s the ingredient.

Using baking soda adds another layer—
because it doesn’t just create texture.

It reacts.

That means this isn’t just sensory play—

it can shift into a science experiment with one small change.

👉 If you want to explore more ways baking soda creates reactions like this, take a look at our baking soda experiments collection—it’s full of simple activities that build on the same idea.

🎨 Where It Becomes Exploration

At first, they just play with it.

Stretching it. Pulling it apart.

Then something shifts.

They start asking questions.

What happens if they add more solution?
What if they change the color?
What if they mix two batches together?

So they try it.

Adjust it.
Test it again—

just to see what changes.

child’s hands experimenting with baking soda slime on a white background showing adding activator, mixing different colors, stretching glitter slime, and testing texture changes

👉 You’ll see this same kind of hands-on testing when making magic treasure rocks or exploring a sound volcano—both give kids a different way to explore movement, reaction, and change.

🧪 Extend the Fun (This Changes Everything)

Now take it one step further.

Because this slime contains baking soda, it doesn’t just stretch—

it reacts.

Try this:

Drop slime into vinegar
Pour vinegar over stretched slime
Break it apart and watch it fizz

The texture shifts.
Bubbles form.
It breaks down in a completely different way.

And just like that—

it turns into something new.

Child pouring vinegar over glossy purple baking soda slime causing a fizzy bubbling reaction in a clear bowl on a white background

This is where sensory play meets chemistry.

👉 If your kids love how this reacts, try an apple volcano or ice volcano next—both use the same baking soda reaction in a completely different way.

🔧 Tips for the Best Results

Add contact solution slowly (this makes all the difference)
Knead longer than you think—you’ll feel it come together
Use fresh slime for the best stretch
Keep extra ingredients nearby for repeat testing

🍃 The Experience

It starts with the texture.

The stretch.
The pull.

Then something shifts.

They start noticing differences—

how it feels,
how it reacts,
what changes when they adjust it.

What begins as simple slime turns into something they want to test again—

just to see what happens next.

❓ Baking Soda Slime FAQs

Why is my baking soda slime too sticky?
If your slime feels too sticky, it usually needs a little more contact solution. Add it slowly—just a few drops at a time—and keep mixing until it pulls away from the bowl and becomes smooth.

Why is my slime too stiff or rubbery?
This happens when too much activator is added. Try kneading it longer first. If it’s still stiff, you can mix in a small amount of glue to soften the texture.

Can you make slime with baking soda without borax?
Yes—this recipe uses contact lens solution instead of traditional borax powder, making it a simple and kid-friendly alternative that still creates a great stretchy texture.

What does baking soda do in slime?
Baking soda helps strengthen the slime and react with the contact solution to create that thick, stretchy consistency. It also allows the slime to react later if you add vinegar.

Can you add vinegar to baking soda slime?
Yes—and that’s where it gets really fun. When vinegar is added, the slime will fizz, bubble, and begin to break down, turning the activity into a simple chemistry experiment.

💡 Final Thoughts

Baking soda slime takes a familiar activity and gives it more range.

It’s a simple starting point—but it can lead into so many other baking soda activities once kids start experimenting.

It can be:

quick
sensory
exploratory
science-based

And it still delivers that same core moment—

when something simple suddenly becomes something else.

🌈 Keep the Reactions Going

If your kids are hooked on this kind of play, here are a few ways to keep building on it:

Fizzing sidewalk chalk → outdoor reaction play
Magic treasure rocks → hidden surprise reactions
Snow volcano → soft, fluffy eruption with a completely different feel

👉 Or explore your full baking soda activities hub to see how far this one ingredient can go.

Child stretching glossy purple glitter baking soda slime over a clear bowl showing smooth stretchy texture on a white background

This is one kids don’t just make once.

They come back to it—
change it—
test it again—

just to see what happens next.

This baking soda slime recipe is one of the easiest ways to combine sensory play and simple chemistry in a hands-on activity kids will want to repeat again and again.