Plastic Heart made with Milk and Vinegar!

Posted by on January 19, 2016 in Crafts, Holidays, Valentines | 28 comments

A “Plastic Heart made with milk and vinegar”? Yes, I can show you how to make plastic with milk and vinegar! I didn’t believe it either, but it works. Kids will be amazed and have fun with this craft and science experiment. At our Oma and Opa Camp 2015, I used this experiment. I found this on ScienceBuddies.

Plastic Heart made with Milk and Vinegar

Use this idea to make Valentine hearts. ( or any shape you want) No need to run out and buy special stuff as the materials are right in your cupboard and refrigerator.

ll you need is…..


Milk- 9 oz.  2% or whole

Vinegar- 4 teaspoons

Red Food Color – 2 drops (optional)

Small heart cookie cutters (mine were 2  1/4 and 1  1/2 inches across)

Straw or pen to poke a hole (optional)

Pin back or yarn for necklace (optional)

Glitter glue (optional)


Add 2 drops of food coloring to  9 oz. of milk (use 2% or whole)  The color darkens a lot as it dries.

Heat 9 oz. milk in a glass for 2 minutes in a microwave or heat milk in a pan on the stove until hot, but do not boil!

Plastic Heart made with Milk and Vinegar

When hot, but not boiling, add 4 teaspoons of vinegar. Stir the milk and it will start to curdle. When curdled, pour into a strainer. This will look a bit like cottage cheese.

Plastic Heart made with Milk and Vinegar

I used a tea strainer after most of the water was out and squeezed more water from the curds.

Plastic Heart made with Milk and Vinegar

Place the plastic mixture on paper towel. Fold the towel over and over to squeeze more liquid out.

Plastic Heart made with Milk and Vinegar

Press the plastic down to uniformly flatten it out as much as possible. Take a cookie cutter and cut a heart shape from the plastic.

Plastic Heart made with Milk and Vinegar

 I was able to squeeze the remainder of the plastic together to cut out another smaller heart. You’ll notice that the plastic has a little texture to it.

Now, let dry on a flat surface such as a cutting board or counter top for a few days.

Plastic Heart made with Milk and Vinegar


If you want to hang the hearts or wear as a necklace,  put a hole in them while wet. Use the end of a ball point pen and do this everyday while it is drying as it shrinks back a little.

Be sure to clean your utensils right away so the plastic doesn’t stick.

After a few days and the plastic is completely dry and hard, put a layer of glitter glue on top. (optional) Just spread it on the heart generously and let dry. Now, the heart has a shiny side. If you’re hanging the heart, repeat again on the other side and let dry. String a piece of yarn through the opening and wear to school as a necklace. Another option is to glue a pin back on it. School friends will be amazed that you made a Plastic Heart from milk and vinegar!

This process is actually how many plastics are made. To see a scientific explanation, go to Science Buddies.

Plastic Heart made with Milk and Vinegar

Did you learn something new? I was skeptical when I first tried it, but it worked. Amazing! So, I adapted it for Valentine’s Day. Any cookie cutter or food color will work. Think of animals, insects, or basic shapes to use for other cut-outs. 

Have fun!


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  1. No WAY! Phyllis you’ve blown my mind!! I have to do this even if just to convince myself that it can be done! Thanks for sharing at Five Star Frou-Frou. Love, Mimi xxx

    • It works! I didn’t believe it either until I tried it!

  2. This looks so adorable! Pinned and tweeted. Thanks for coming to our party and sharing such an cute masterpiece! I hope to see you next Monday @7 because we love to party with you! Happy Wednesday! Lou Lou Girls

    • When I first made it, it seemed ok, but lacked a little sparkle. The glitter glue worked!

  3. How scientifically creative! And fun!

    • Yes, it is! I learned something, too!

  4. What a sweet idea to make with kids. My nieces would love making these!!

    • Yes, make fun memories with this science craft!

  5. I am amazed by this! Thanks for bringing it by Throwback Thursday, and thanks to all your posts, I’m thinking now we might have to have a Valentines Party! 🙂 I’ll be pinning to our board!

    • It’s amazingly fun!

  6. Just had to print this out so I could make this. Will tell my only grand child that likes to craft about this. Will be fun to make together. So glad you shared this with us all. Will be fun to see how it turns out. Now where are my heart cookie cutters? This is so great, love it.Happy weekend

    • Yes, you’ll have fun doing this. The only hard part is waiting for it to dry for a couple days.

  7. What a neat idea! I have many friends with little ones who will enjoy this craft idea. Thank you for sharing with Thankful Thursdays.

    • Great! Thanks for stopping by to comment and thanks for sharing with your friends.

  8. Wow, how fun!

    I have to try this with my two girls. I think I might also put the idea to the school creative committee who are trying to think of ideas for craft / activity afternoons.

    • It might be difficult to use with so many kids, but a demonstration might work.

  9. Neat! We’ll have to give that a try. 🙂

    • Good for you and you’ll be amazed at how it works!

  10. How fun! You really have a lot of games to choose from:). Thanks for sharing at Funtastic Friday.

  11. How cool! Thanks for sharing 🙂

  12. That’s so cool! and a little gross lol! Still want to make it though.

    • I would call it fascinating rather than gross! Have fun making it!

  13. What a cute thing to do with your kids for Valentines day.

    • It’s a 2 for 1…..both a Valentine activity and science experiment!

  14. Very cool! We’ll have to try this!

    • The kids will love it!

  15. Lovely!!! I will try it with my grandchildren on their omaday. Thank you.

    • You’re Oma, too? How fun for your grandchildren! You might find more ideas on my Oma and Opa Camp posts.

Love to hear from you!

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