How to Make Slime – A Safer Recipe for Kids


how to make slime activity

Slime is the new popular activity for kids! In just 5 easy steps, you can join in on the fun. Experiment with different colors and add fun items like glitter and beads! You can also use this as a sensory experiment for kids that need tactile and visual stimulation.

There have been some concerns about using Borax as an ingredient in making slime, so we’ve got an alternative that is safer for kids – contact lens saline solution!


  • 12 oz of Elmer’s white glue
  • 1 1/2 tablespoons Baking Soda
  • 2 tablespoons of contact lens saline solution (or more, add as needed)

(NOTE: This is for a large batch. You can divide the amounts by 3 and make a smaller batch, especially if you want to test the recipe first. The contact solution binds the ingredients together.)

Additional items:

how to make slime ingredients

How to Make Colorful Slime

  1. Pour 12 ounces of glue into a container to mix your slime in.
  2. Add 1 1/2 tablespoons of baking soda. Mix together.
  3. Add drops of washable glitter paint. This won’t stain your hand like food coloring will! Mix together again. You can even add more glitter if you’d like. It says inside the slime!
  4. Add 2 tablespoons of saline solution.
  5. Mix the saline solution into your slime until it starts to form together

making slime


  • The less paint/color you add, the more pastel your slime will be.
  • The less saline solution you add, the more flexible your slime will be.

Now you have slime! Mold it into different shapes and have fun with different color options. You can store the slime in plastic containers to use later, but it’s best and most fun to play with right after it’s made.

how to make slime

Slime Tips:

If your slime won’t stick together, try adding more contact solution so it bonds together better. If it is too sticky, you can add more baking soda. If it is too hard and not flexible, you may have added too much contact solution. Knead the slime and work it through your hands really well to see if it loosens up. If not, we recommend making a smaller batch of slime with 4 oz of glue and 1/2 tbsp baking soda, and then 1 tbsp of contact solution. Mix together and add more contact solution if needed.

Sensory Experiments for Slime

Making slime is also a great activity for sensory stimulation! Here are a few fun experiments.

Add Texture:

Add gems, beads, glitter, or poly beads for an even more exciting sensory experience! Choose different colors and shapes to create a unique feeling and help with tactile stimulation. Also, if you use clear glue instead of white, you can see the items and not just feel them! TIP: It’s easiest to add the items before you mix in the saline solution.

Add Shapes:

You can give your slime different shapes using cookie cutters! We made several different colors of slime and added some shapes to it, like hearts and circles. If you don’t press down completely, the shapes fade after awhile. Have fun with it and play around with the designs!

slime sensory activity

Testing Ingredients:

Experiement with different amounts of each ingredient. Ask kids to answer questions as you go. What happens when you add more than 2 tablespoons of saline solution? Does adding more or less baking soda make a difference in how the slime feels?

Mixing Colors:

The great thing about slime is you can use any colors you want! To create a marble effect, first complete all 5 steps with one color. Then, choose another color to make and during step 5 as you add the saline solution, knead the finished slime into it. We did this with pink and blue!

marbled slime

PLEASE NOTE: Adult supervision is recommended for this activty. Although contact lens saline solution is a safer option than Borax, it does still contain Boric Acid, and should not be ingested.

Check out some great photos and feedback on Pinterest from others who have tried this recipe!

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55 thoughts on “How to Make Slime – A Safer Recipe for Kids

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  4. The recipe worked fine, and the slime was great at first. But, after storing it in a ziplock bag for just a couple of hours, the slime became hard, and a liquid was inside the bag. It was very strange. What am I doing wrong?

    • Hi Ell, sorry to hear your slime did not store well in the plastic bag! We have heard from several people who have made slime that it does last if sealed in a plastic bag with no air getting through, but maybe you could try a plastic container instead? We have also heard refrigerating it will help make it last longer. The liquid does sounds normal though, we found it does get a bit liquidy when you store it. Hope that helps!

      • Ours was rubbery this morning but the kids were still messing with it. However, it has disappeared and I think the dog swallowed it. Will his stomach be able to break this down and digest it?

    • Hi Mary, we have not personally tried the recipe with Thera Tear eye drops, and after looking up the ingredients it looks like they are not the same as the saline solution. If you want to make slime I would stick with the saline contact solution, but you could always experiment with a small batch. Thanks!

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  6. hi I used 1/3 measurements and it worked fine, u must use baking soda not bicarbonate of soda, any pva glue will work, you make saline solution with water salt and baking powder.

    • Hi, just tried and didn’t work. We used bicarb which is American Baking Soda. British baking powder is something completley different to both, mixed comments on using bicarb or not did you use baking soda or baking powder please?

    • Hi Nikki, if your slime came out really runny, you can try adding more contact lens solution. This is what binds the ingredients together. If that doesn’t work, try adding more baking soda. We have also had someone tell us that adding corn starch helps make it less runny. You can try making a smaller batch and test this out, so you don’t waste ingredients.

  7. Hello! We have used this recipe and the slime comes out more solid with little “give” or pull. I was hoping for the consistency of the borax recipe. Do you have any ideas to make the consistency more pliable?

    • Hi Kim, you could try the recipe again but this time add the contact solution slowly, like a few teaspoons at a time. Knead the slime and work it through your hands really well, then keep adding more solution a little bit at a time. The solution is what binds it together, so it’s possible yours is binding too much. I think it also depends on the type of solution you use and the type of glue. Everyone seems to have a slightly different result even with this same recipe. You can also do a search for “non-stretchy slime” to see if anyone else has some tips. You can also make a smaller batch so it’s easier to test. Hope this helps!

  8. Hello, we followed all instructions kids had a blast playing with it … stored the slime in a plastic container and its as if the glue just hardened and the liquid didn’t hold … did everything to try and kneed it but it’s to hard … please let me know of a better way to store as the suggested way didn’t work. Thanks

    • Hi Jessica, we have heard that putting slime into plastic bags and in the refrigerator can help it last for a few weeks. We stored ours in a tupperware container and tested it the next day, but no longer than that. Let us know if you find out what works best!

    • Hi there, we have not personally tried making slime with expired contact lens solution, but I don’t see why it would not still work in bonding the ingredients together especially if it’s only a few months old. I would say give it a try!

    • Hi Pat, did you try kneading it to help smooth it out? I am not sure why it would come out chunky, you could add less baking soda and see if that helps. We were very specific about following the recipe and ours came out pretty smooth. Hope that helps!

  9. This worked great! My toddlers had a ball making it and playing with it. Each one wanted a different color, so we used the 6oz Elmers glitter glue, so we just cut the ingredients in half. Thank you so much for this recipe!

    • Hi Lara, we appreciate your concern. Contact lens saline solution is safer than borax due to the fact that you can use it for contact lenses that go into your eyes, and although it does have some boric acid it is in a much lower concentration. Many sites are recommending the use of the contact lens solution to avoid burns that were being caused by borax.

    • Hi Vicki, Elmer’s Glue is a particular brand of glue, very popular here in the US. It is technically “PVA based” but I have read many sites consider it PVA. Hope that helps!

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  11. I went by this an it did not work at all you couldn’t pick it up it was just like the glue I went exactly by the recipe I had to use all most 2 boxes of baken soda an now its not slime it’s more like Play-Doh

    • Hi Shelly, we used this recipe at our organization and it did produce slime. It was also based on the Elmer’s recipe they have posted on their site. I am sorry to hear it didn’t work for you! You did use Elmer’s School glue for the project?

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    • Hi Amanda,

      To make slime (borax-free) you need Elmers glue, contact lens solution, baking soda, and food coloring (or washable paint). Any ingredient in the blog post that has a blue link will take you to the product on our website. If you read through the blog, there are step by step instructions on how to use each of the ingredients to make slime. Thanks!

      • Using contact solution DOES NOT make a borax-free slime. Boric acid and sodium borate are in contact solutions (ie, Kirkland Signature Lens Cleaner).

        • Hi there, thank you for you comment. Yes the contact solution does contain boric acid, as we stated in the blog “Although contact lens saline solution is a safer option than Borax, it does still contain Boric Acid, and should not be ingested.” We didn’t claim this was a borax free recipe, just that it was safer to use contact solution than borax, as this will not burn your hands.

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