Fun Activities for HomeRecipe for "Gack" This was a fun activity we used in class to smash and smooth.1 cup room temperature water1 cup white school gluefood coloring1 1/3 warm water4 tablespoons Borax laundry boosterMix together room temperature water, glue and food coloring in a medium bowl. Set aside. In another bowl, mix together warm water and Borax until completely dissolved.Next, slowly pour the glue mix into the second bowl with the Borax solution, but do not mix them together.Roll the glue mix around in the Borax solution (around 4 or 5 times). Then lift the glue mix out of the Borax solution. Knead for 2-3 times.Store in an airtight container or plastic ziplock bag.