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Cut the tubing. Measure the mixture. Grab other materials.
Using regular scissors or a knife, slice the 3/8 inch latex tube. Each grenade will require at least a 6-inch long tube. You can use longer tubes for larger grenades if you prefer. Measure each section prior to cutting for consistency. Go ahead and tie one end of the 6-inch tube into a knot. Using a measuring cup, measure cup of flour and cup of corn starch. This will be used to make the paint. Grab the food coloring and set aside. You can add this directly to the mix so it doesn't need to be measured out. You can use non-toxic, washable kids' paint as well if you want to save more time. A medium sized pot will be needed to create the grenade filling. Make sure you also have a syringe or spray bottle, cotter pins or bobby pins, a clamp and several washers before getting started. If these items aren't readily available at home, they can be picked up at a local hardware store.