This slime provides hours of fun and exploration around the theme of ploymers and non-newtonian fluids.
You will need:
1/2 cup of PVA Glue
1/2 cup of WARM WATER
1 tsp of Borax
1 cup of WARM WATER (Very important to dissolve the crystals)
1 mixing bowl
Food colouring (optional)
First fill a small cup half way with some PVA glue. This glue must be PVA, clear glue is not as effective!
Then add 1/2 cup of warm water and stir with a metal spoon until it is an even consistency. This is a good time to add food colouring if you would like. 4-5 drops maximum to avoid staining everything.
Now pour a full cup of warm water and add one teaspoon of borax. Stir this until the crystals have dissolved.
Add a small amount of the borax solution at a time to the PVA glue mix stiring with a spoon until the mixture starts to thicken. STOP NOW: You do not need to use all the borax solution. Usually a very small amount is all that you need to thicken the mixture.
Now work the mixture with your hands in a mixing bowl and fold around 15-20 times until it is an even consistency.
If you mixture feels really sticky then you have too much glue. Add a little warm water and massage it back to life. If this doesn't work consider adding a little more Borax solution.
If your mixture breaks easily then you have added too much borax. Try adding a little more warm water. If this doesn't work add a little more glue to the mix.
The slime should last a few months in an airtight container. Massage some water on your slime before you put it away and when you get it out to play next.
What is happening here?
The borax molecules hook on to the glue molecules to create a long string of molecules.
Subsitute 1 1/2 tables spoons of Contact lens solution. Add this at the same stage in the recipe a small amount at a time. The resulting slime isn't as long lasting but still lots of fun to play with.
Borax Free Slime
Now that your have made your slime you can investiate it's non Newtonian properties.
Try pulling your slime apart really quickly. What do you notice?
Try holding the slime still in your hand applying no force to it. What do you notice?
What happens to the consistency when you have been playing with your slime for a while?
What is the consistency of the slime when you leave it on a table for a few moments?