We've made slime during the summer science program before. (Click here for our previous page on the chemistry of slime.) This recipe is probably the most slimey we have encountered to date. To make it all you need is guar gum and borax and water. It even has it's own unpleasantly slimey yellow green color!
Place about 1/4 teaspoon of Guar Gum (health food stores like Outpost sell it) in 1/4 cup of warm water. It doesn't really dissolve all that well, but that's OK.
To make the borax solution you need to take borax from the store and add enough of it to water that there is still white powder at the bottom of the container. This is what we call a saturated solution.
Add about 20 drops of the borax solution to the guar gum water mixture and mix. In a short while you'll have some of the slimiest goo you've ever made.
If it is too runny when you first do the experiment you can add a little more borax. If it gets too solid right away you probably added TOO much borax, and you should start over with the guar gum solution and add less. Sometimes if you use too much guar gum is also gets more solid.
Like any slime, this stuff will wreck a carpet if it sits in it overnight, so be careful when you play with it and don't let it sit out or it will dry up and lose all that slimey charm!