Another super easy and simple video on how to make Dinosaur Eggs. This time we are using Plaster of Paris and water. The recipe is super simple - for one cup of plaster of Paris add half cup of water. That's it! For bigger balloons it is best to use 2 cups of Plaster of Paris and 1 cup water. Add these two ingredients to a plastic bottle, shake well and pour the mixture into the balloon. You will need to move the balloon for about 5 to 7 minutes so that the mixture spreads evenly inside the ballon. Then put the balloon in a safe place and wait until it dries. The kids will love these dinosaur eggs, guaranteed!