Gack and other assorted gooey things you can make as experiential, "hands on learning tools."

These are related to the process of change and helping turn Caterpillars into Butterflies:


Basic, Bombproof Gack

Take 2 cups Elmer's Glue mixed in 1.5 cups warm water with food coloring added "to taste!" and combine with a mixture of 1.5 tablespoon Borax mixed in 1 cup hot water.

from The Children's World Learning Center in Charlottesville VA (via Ted Forbes)

Oobleck:

50 cc's of cornstarch (2 big tbls) and about 25 ml of water. Remove from cup and knead. Add few drops of water if oobleck is too crumbly.


Glurch 1:

You'll need 45 ml liquid laundry starch, 25 ml white glue and a pinch of salt. Put starch into plastic medicine cup, add salt, stir, add glue and stir. Squeeze out excess starch with fingers. Remove from cup and knead. Add a few grains of salt if too runny.


Glurch 2:

20ml Elmer's white glue mixed in 25ml water; add food coloring as desired, stir well. Stir while adding either enough 4% sodium borate solution (Borax) or liquid Sta-Pruf starch (the blue stuff is the only one that works) until the glurch forms. Pour off excess liquid, then dump glurch onto wax paper for a minute or two. Let students knead glurch and you have it. If the stuff is too sticky, too little borate/starch was used. Hot water dissolves the Borax better.


PVA Slime

To a 4% solution of 25 ml of polyvinyl alcohol (PVA) add a couple of drops of food coloring, then 6-7 ml of saturated (about 4%) borax.


Another fun recipe:

To about 25 ml of white glue (not all brands work equally well) add a drop or two of food coloring and then 12 ml of liquid laundry starch concentrate. After stirring and kneading, this makes something I have seen called "gloop", "oobleck" or "homemade silly putty".


Yet another fun recipe:

To an Amway Home Products product called "Fabric Finish" (25 ml) add the food coloring and about 12ml of the liquid laundry starch concentrate as noted above. This is also a PVA slime although the properties are different from those of #1 above.

Most from an internet discussion with one of the editors of Bob Pike's Newsletter

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