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Join
the American Chemical Society at the Illinois State Fair, August 12-21, 2005, Springfield,
Illinois |
"Gack"
At the State Fair we demonstrated "Slime", which is made with polyvinyl alcohol, a substance not readily available to the public. Gack is a similar material made with everyday household materials.
| Chemicals: |
All chemicals can be bought at a grocery store. |
| Materials: | Two large plastic glasses (clear if possible) and a spoon to stir. |
| Notes: | Gack is also known as "Flubber". |
Procedure:
- Put about 4 oz. of water in one plastic glass. Add Borax. Stir with spoon.
- Continue to add Borax and stir until no more will dissolve.
- Put about 4 oz. of white glue in a second plastic glass.
- Dilute the glue with 4 oz. of water. If, at the end of the experiment, the resulting GACK is too thick, try it again adding more water.
- Add a small amount of your favorite color of food coloring to the glue solution and mix well.
- Pour a small amount of the Borax solution into the glass with the glue, being careful not to transfer any solid Borax into the glue.
- Stir well.
- If some of the glue solution doesn't thicken, add more Borax solution and stir again, repeating the process until the entire mixture has thickened.
- The resulting GACK should be rubbery, and will slowly flow from a high spot to a low spot, such as if you try to pour it out of the glass.