Goop (Cornflour + Water = Fun!)

This was one of our very first Show and Tell Weekend Projects. I found the link for some awesome Goop projects here.


You will need:

• 1 x 500g packet of Cornflour
• About 1.5 cups of water
• 1 large roasting tin, plastic tub or similar (we used a never-been-used cat litter tray)

Method:

1. Add the water to the cornflour slowly while mixing (which is so hard considering mixing cornflour is like mixing broken tiles), until you have a sort of custardy mix. If it does become too liquid, you will need to add more cornflour or just play with it for a while and the liquid will evaporate eventually.  I have even put mine under a fan for 20 minutes when I overwatered once and it evaporated really well.
2. Have the best time!

No pressure = Runny goo

Goop is amazing because when it is left it relaxes into an almost liquid state, you can pour it, swirl it and tip it from side to side, but when it is squashed, compressed or even hit it becomes immediately rock solid. (find the science behind it here).

What all that means is that kids can really get their hands into something completely mind boggling, messy (and yet not difficult to clean up!), non-toxic (it's completely edible even if tastes disgusting) and magical!

My son was 1 year and 2 months old and had almost as much fun as his 4 year old sister did. FINALLY someone let him play with spoons of liquid and pour stuff on himself without fretting. Bliss.

Pressure = Hard ball!

A quick video of the pressured vs liquid state:

We used a number of different kitchen utensils to scrape, scoop, smack and stir.

The clothes peg is a surprise success!

 

 

 When it's stringy like this it always reminds me of the "Blue Goo" from Dr Seuss' "Fox in Socks":


Yep, that's the stuff.

 Eventually after what must have been an hour of playing we realised the water in our cornflour had almost all evaporated, probably assisted by the children's body heat and constant movement.  I am sure you could add more water and start again, but I took it as our cue to bring the experiment to a close.

This return to a powdery form is also why goop is so easy to clean up. Once we were all finished I went over the room with a vacuum first and then wiped the rest away with a wet kitchen towel. Rinse and repeat.

Honestly, writing this blog makes me want to do it all over again tomorrow!  What a blast.  Clever Daughter actually said how lucky it was that it had rained and we had to stay home, because it was the best fun EVER.

This is a little video of our fun:

Some Crafty Kids think Gloop is:
Fun: 10/10
Educational: 10/10
Show & Tell-worthy: 10/10

Experimenting with Water Absorbing Crystals (The powder inside nappies!) for Home-made Fake Snow

This was a very cool experiment.  I had found a Pinterest Pin a few months before which lead here and I think I forgot the bit about it not actually being the powder from inside nappies. So when we did it, ours went a little something like this:

Home-Made Fake Snow

1. Get about 3 or 4 baby nappies you won't need and prepare to shred them.

 

2. Tear the inner lining of the nappy rather forcefully (or cut with scissors!)  You will be met by many layers of cotton wool, but what we want is the grains of powdery crystals which will immediately start to come out. We found shaking and patting the nappy over a large bowl got quite a good yield of crystal powder.  This powder is the hydrogel or water absorbing crystals which usually soak up all of baby's... wetness. 

3. Cotton wool will also fall into the bowl, just pick out the worst bits, give the bowl a good swirl around and the crystals will sink to the bottom and you can try to pick out the rest of the wool. If some remains it will not affect the outcome.

Our collection taken from 4 nappies.

4. Now to add water. We started out with a 1ml dropper

But after 13 drops the gel was still sucking up the water and the kids were getting impatient and looking forward to playing with it!

 So we started again:

• 90mls water + 1 teaspoon powder.

• Wait a little bit and watch those little crystals sucking up all that water.

Jenny was amazed as we realised it has changed from a liquid state to a solid.

•  This is how much "snow" we got from one teaspoon of powder and it would have gone further if we had given it the water and some time.

It is completely safe to handle and hold. But I would say don't eat it. 

 

Play time!  Spoons, bowls and bare hands squashed, scooped, sprinkled and squeezed away about 30 minutes of focussed (semi-messy) fun.

The crystals have a lovely soft texture.

 

You just can't squeeze the water out of there.

Then Clever Daughter looked around the kitchen and said "What happens if we add salt?"  Now I must say that I think she said this because she isn't allowed to play with the salt shaker and thought this might be her chance. But I thought Salt Does Do Weird Things To Water, Let's try!

Yippeee! Happy to add some salt.

 The salt transforms the "snow" back into a liquid!

Left: No Salt; Right: Salt Added.

So I thought I would do one last change up with this fabulous stuff, threw a random amount in a baby food jar with some blue food colouring. Closed the lid and shook it up.

Like an iceberg sucking up the sea...

The kids had a great afternoon, and it was definitely worth the nappy sacrifices.

 

 

Some Crafty Kids give Home-made Fake Snow:

 

Fun: 8/10

 

Educational: 9/10

 

Show & Tell-worthiness: 7/10