Supplies: Borax (from the supermarket or a small box from laundromat) Elmer's Glue-All (White only) Food Coloring (optional) Water One large plastic jar w/screw lid - ala a large peanut butter jar One plain old cup Instructions: Step "1" Add together; 1/3 cup Elmer's Glue 1/3 cup Water Food coloring Shake, stir or mix these ingredients until glue dissolves in water. Step "2" Fill an empty cup with 1/3 cup of water Slowly pour in 2 tablespoons of borax, allow …
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showed last 75 words of 243 total
…boron, sodium, oxygen and water. When you add water to elmer's glue the PVA, being unstable, starts to dissolve in the water. When you add the wet borax, it is slightly acidic, and it reacts with the PVA to crosslink. This crosslinking causes the guk to undergo an irreversible gelation reaction much like when an egg boils to become a hard boiled egg. It is safe to handle, but hey! let's not eat it...OK?