How to make the best slime

We’ve been busy making borax free slime today and thought it would be fun to try three different slime recipes then create tests to see which we liked the best.

No Borax Slime Recipes

Cornflour Slime

Simply add a little water to cornflour and you get a slippy slime that can be scrunched up into a solid ball, but if you unclench your fingers it flows like a liquid again. Cornflour gloop is a non-Newtonian fluid which means it doesn’t flow like liquids usually do.

Cornflour Chia Seed Slime

Soak a handful of chia seeds in water for a few hours and then add cornflour and a little water. This makes a lovely thick slime, which flows beautifully through little fingers.

Fybogel Slime

It sounds a bit odd, but Fybogel makes a brilliant slime. Add a sachet to water and boil on the hob or in a microwave, once boiled leave to cool, you should be left with a sticky, gloopy slime!

How can you test slime?

We thought very carefully about how to test our slimes, and devised three tests.

The Stretch Test

This involved trying to stretch the slime between our hands.

Winner – Fybogel Slime

Remember to use the same amount of each slime.

The Viscosity Test

We set up a viscosity race to investigate which slime was the most viscous. Viscous liquids are thick and flow more slowly than less viscous liquids.

Winner – Cornflour Slime

Remember to use the same amount of each slime and time how long each takes to flow between the same two points.

The Splat Test

For the splat test we picked up a handful of slime and threw it at a piece of cardboard. We decided the best slime would be the one which made the biggest splat.

Winner – Fybogel Slime

Remember to use the same amount of each slime, throw from the same distance and with the same force.

For more fun slime recipes to test, try some of the great no borax slime recipes over on Red Ted Art. We can’t wait to see how they do in our splat test!

We’ve also got a creepy Halloween slime to try.

Slime – Learning Points

This is a great activity for starting to think scientifically. For each test discuss how to make it fair, for example standing the same distance from the splat board and throwing the same amount of slime.

Try asking children to predict which slime will be the best in each test based on their existing knowledge.

More Slime Activities

Can you make a better slime? Try adding chia seeds to the Fybogel or using different amounts of water.

Links with English

Can you write a story featuring slime?

Can you write a set of instructions so someone else can follow your recipe?

Links with Maths

Can you record the time taken for the slime to flow between the two points on the viscosity board and plot the data on a graph?

If you liked this activity you might like our walking on oobleck activity too!