1/2 cup white glue
6 Tbsp. water
1-4 tsp. Borax
1-4 Tbsp. water
Mix the glue, 6 tablespoons water and food coloring until it is dissolved.
(the glue and water is very nearly half and half. ie 1/2 cup of glue to 1/2 cup of water.. you can always experiment to find the best mix)
In a separate bowl, dissolve 1 teaspoon borax into 1 tablespoon water. Add to the glue solution. You will get a very thick clump of slime when the two mix. Pull the clump of slime out of the glue mixture and put it in a separate bowl.
Mix another batch of the borax solution and add to the remaining glue mixture. Repeat until all the glue mixture is used (about 3-4 times).
With clean hands, knead the slime to mix. This will take about 10 minutes and is not very difficult as the slime easily separates between your fingers.
If a looser, more slimy texture is desired knead in a bit more water. The more water you add, the slimier it gets.
The slime doesn’t leave a residue and doesn’t get stuck on anything although the food colouring may stain depending on what you used
Store in an airtight container. This can easily be doubled, tripled or quadrupled.
How it works:
White glue is often known as PVA glue.
PVA (in white glue) stands for Poly Vinyl Acetate.
PVA molecules are quite large and easily get tangled together which is why white glue is thick and viscous. When mixed with borax some of the PVA molecules join together (polymerize) and get even more tangled.
Slime – Polyvinyl Alcohol with Borax
(needs adult help and laboratory facilities.)
Note: There is another form of PVA which is Poly Vinyl Alcohol.
Polyvinyl Alcohol makes a better slime but it is a lot more difficult to get hold of. It also comes as a white powder which needs to be dissolved in hot water
Description: This demonstration is typically performed as a hands-on activity for younger audiences but can also be used to discuss polymerization. Two clear colorless liquids are mixed and immediately form a gel with interesting physical properties.
Making the solutions requires laboratory apparatus and is not straightforward, however once the solutions are made the slime is quite easy to make.
It is recommended that the solutions are made in bulk, stored, and used when needed.
Hot plate w/ thermometer
beaker w/ stir bar
1. Separately prepare a 4% solution of PVA (4 g dissolved in 100 ml of hot water at 70 °C; do not boil) and a 4% solution of borax (4 g
borax in 100 ml of water).
Note: The PVA does not dissolve easily which is why the use of an electric hot-plate and laboratory stirrer is recommended.
Food coloring may be added to the borax solution.
2. The two solutions will be mixed in a 10:1 (PVA:borax) ratio. Add 50 mL of PVA solution to a 250 ml beaker.
(If this is being done with lots of pupils disposable cups are recommended instead of the beaker)
To this, add 5 ml of borax solution and mix vigorously with a wooden stirrer. A clear gel should form immediately.
The viscosity of the gel can be altered by changing the ratio of PVA:borax.
3. The gel formed can be kneaded into a ball or slowly stretched but snaps when quickly twisted or pulled.