1 Cup of dry cornstarch
Large bowl or pan
Food coloring (optional)
1/2 Cup of water
1. Put newspaper down on the table top.
2. Put the cornstarch into the bowl. Add a drop or two of food coloring. Add water slowly, mixing the cornstarch and water with your fingers until all the powder is wet.
3. Keep adding water until the gunk feels like a liquid when being mixed slowly. Then try tapping on the surface with finger or a spoon. When gunk is just right, it won't splash--it will feel solid. If gunk is too powdery, add a little more water. If it's too wet, add more cornstarch.