From 1,444 Fun Things to Do with Kids comes goop. Start with 8 ounces of white glue, food coloring, water, and borax.
Combine glue, three-fourths cup water, and food coloring in one bowl. In another bowl, mix one-fourth cup water with one tablespoon Borax, and add this to the first bowl, stirring until it forms a Goop ball. Remove the ball. Again combine one-fourth cup water with one tablespoon Borax and mix it into the glue mixture, stirring until another Goop ball forms. Keep repeating the process until the glue mixture is gone. Then knead all the Goop balls together. Now you’re ready to play by pulling and patting the Goop into strings and unique forms. Store the Goop in an airtight container.
We only really managed one-round of Goop (see video). We also couldn’t find any food coloring on-hand and so made white Goop.