Halloween Activities: How to Make Fizzing, Melting Frogs!

finished frogs title pic 2

Time: 30mins – 1hour, Mess Level – High, Difficulty Level – Easy

So with Halloween almost here we have been trying out some fun but spooky activities.  For those who got our October Wizard Bramble Box, instructions on how to make your own fizzing, melting frogs are included in your kit. This is a very fun, sensory and science based activity but is also very messy; we did this activity outdoors for an easy clean up.  Adult supervision is always recommended.

You will need the following household items:

  1. A mixing bowl and spoon (we decided to use a stick to mix)
  2. Measuring cups
  3. 1/2 cup of corn starch
  4. 1/2 cup of baking soda
  5. Vinegar
  6. Googly eyes
  7. A cup, jar (to throw the frogs into) or paper plates (to place the frogs on)
  8. Green washable liquid paint (we used tempera)

To make this activity more fun (and wizardy) I added some spooky 100px labels, ‘Starch of Cornea’ for corn starch, ‘Horn of Bicorn’ for baking soda and ‘Frog Juice’ for the green, liquid paint.

you will need

Add 1/2 cup of baking soda, 1/2 cup of corn starch into the mixing bowl (magic wands and wizard spells are optional, but very fun).

tip into bowl

Start to mix and gradually add the green, liquid paint until it starts to form a dough.  It’s pretty hard to judge how much to paint to put in (especially if the kids do a giant squeeze) so for the more scientific we used almost exactly two ounces of liquid paint.


If the kids go wild and add too much then you can get the dough back on track by adding small, equal amounts of the baking soda and corn starch until you get the right consistency. You want it to be like a dough but it will also ooze when held. After you’ve mixed it up, wash all the little (and big hands) and give the dough a final knead.

just play with the dough

This dough offers a fantastic sensory experience. It’s mold-able and squashy but will ooze out of your hand, a bit like oobleck (if you’ve ever made it).  There’s lots of play right there just with the dough.  However, if your child is anything like my son, they will probably want to skip right to the messy, disgusting part.

melting the frogs

Once you start the fizzing, melting process you can’t get the dough back; it will literally fizz, melt and dissolve into a green liquid (it is easy to make more though).

We plopped our frogs (blobs of dough) onto paper plates (our melting zones) and added two googly eyes each.

Finished fizzing dough frogs

First of all we sprayed a little vinegar on them and not much happened (we were a little impatient), so we poured a little on.  They started to fizz and dissolve.  We talked a little about the science behind the reaction and how the acid (vinegar) and the base (baking soda) where undergoing a chemical reaction and talked about the bubbling gas being released.

Fizzing, melting dough frog in vinegar

Of course, my kids said, “well what happens if you throw the whole frog in vinegar?”. This bit was VERY very messy (and I’ll stress again that we were outdoors for easy cleanup). The kids dropped a frog right into a jar half full of vinegar and we watched to see what would happen. They were not disappointed! Good bye our froggy, dough friend.

fizzing frog 2

Please remember to use parental judgement with regards to the age appropriateness of activities and your child(ren).  This chemical reaction releases a gas and if using a jar, a lid should never been placed on the jar, as the gas could cause it to explode / break.  The ingredients in this dough are generally considered non-toxic but ingestion should be avoided and therefore this activity may not be suitable for children under the age of 3.



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