This week at Crafternoon we made SLIME. It turned out slightly putty-ish — a denser sort of slime — but everyone loved it! Here’s how we did it.
(First, let’s have a brief chat about Borax. The bottom line is that you pretty much need Borax to make good slime. But I have seen questions from people online about whether Borax is safe to handle. The most informative thing I’ve read on the subject is here at Crunchy Betty. My personal feeling is that it’s fine — we’re using a tiny amount and we’re not eating it or anything. But I always like to let people know ahead of time that we’re using it, so that they may make their own decision. There is a recipe you’ll find on the Internet for “slime without Borax!” that uses commercial liquid starch. But, as it turns out, one of ingredients in liquid starch is Borax, aka sodium tetraborate (which is why it works to make slime; surprise!). But in addition to the Borax it has a bunch of other chemicals like formaldehyde, so … I don’t like to use it. I just make my own liquid starch, and add a little Borax. Now, on to the recipe!)
Ahead of time, I made my own liquid starch and mixed in some Borax. To do that, bring 3.75 cups of water to a rolling boil. In a little cup or mug, mix 1/4 cup cold water with one tablespoon of cornstarch and one tablespoon of Borax. Whisk thoroughly, then slowly add to the boiling water. Let the mixture cool. You can also totally make slime without cornstarch — just mix water and Borax together during this step. But I feel like there’s something about the starch that just makes better slime, so I go the extra mile.
To make the slime, put about 1/3 cup of white glue (we used Elmer’s) into a gallon-size zip-lock style bag. Add about half as much liquid starch. Then squirt in some liquid watercolor (or food coloring, but be careful because it stains). I always use Watercolor Magic and let the kids squirt it with a pipette — so fun and great for their fine motor skills. We also put in some extra-fine glitter, which was fun.
Next, zip up the bag tight (get rid of the extra air inside) and start squishing everything around. You’ll want to knead and squish until the majority of the liquid is absorbed and you have a nice gloppy goo.
Then, dump out your gloppy goo onto a paper plate (I prefer the kind that’s sort of shiny so the goo doesn’t stick) and knead it around some more. The more you knead it, the nicer and softer it will get, and the less sticky.
Once it’s all nice and smooth, you can play with it! Try stretching it, forming it into a ball, making impressions in it with rubber stamps, and cutting it with child-safe scissors. It’s all fun! When you’re done playing, seal it up tight in your same plastic bag and it will keep for a good long while.