Everything you ever wanted to know about slime

The Girlguiding guide to slime - from easy DIY recipes to slimey facts to the science behind the ooey gooey gunge

Girlguiding slime team
04 May 2018

It's slime time!

We know lots of you love to make ooey, gooey, grimy slime. Whether you love it for how it feels, the sound it makes or you just love to make slimy mess, check out our guide to all things slime below. We want to hear about your adventures in slime too. Share your feats (and failures!) with us on Twitter and Facebook with #slimetime. 

Make your own Girlguiding slime

Watch our video to see what happened when we tried to make our own Girlguiding blue slime.

You can find our recipe in the activity finder (where you'll find all important planning and safety advice too). We used a basic recipe of cornflour and water, with a little bit of contact lens solution, to keep it simple. But if you're a slime making master and think you can do better, tell us your secrets on Twitter and Facebook with #slimetime.

The science behind the slime

Did you know that slime is a non-Newtonian fluid? What's a non-Newtonian fluid I hear you ask? Well, it's a fluid that's not a liquid or a solid. When you pick it up, it will feel like a solid but then it’ll ooze like a liquid. 

The thickness of a fluid is known as its ‘viscosity’. The more viscous a liquid, the slower it would flow – think water vs. ketchup. You can change the viscosity of slime but squeezing it, stirring it or adding pressure. When you add pressure or hit the slime, the particles squeeze together making it feel more solid.

5 slimey facts

  1. World's LARGEST slime - Back in the distant days of 2017, 12 year-old slime maestro Maddie Rae slimed her way into the Guiness Book of World Records by creating the largest slime the world had ever seen. It was a seriously heavy six tonnes. Now that's a lot of slime.
  2. World's LONGEST slime - Not to be out done, this year 10 year-old Ciela Villa stretched her way into the Guiness Book of World Records. She achieved the record for longest distance to stretch home-made slime in 30 seconds when she stretched her slime over two metres.
  3. Blennophobia - Is a fear of slime.
  4. Slime goes way back - Slime might be having a moment in the "slimelight" just now but it's history dates back to the 1920s when Nobel laureate Hermann Staudinger made new discoveries in polymer science (slime is a type of polymer). He suggested their structure was made up of repeating chain-like molecules, which is what we know today.
  5. Slime crazes through time  - The recent slime trend is just the latest in a long line. Perhaps the first real slime craze came in the 1950s with silly putty, which was a non-Newtonian liquid just like slime. That meant it could flow like a liquid, bounce like a ball or break if you applied force to it. In 1976 Mattel made the first toy that went by the name of slime, a green substance that came in a rubish bin. Since the 1980s slime has been a stalwart of kids TV too, especially on Nickledeon when guests would regularly be slimed (like our friend below).