We had all the ingredients, but I would suspect that some people may not have sand readily available to them. It only takes 1 cup of sand to make the five eggs you see in the photo mixed in with the other ingredients.
The eggs are about 4 to 5-inches long and about 3-inches in diameter and we used an air dry method with plastic dinosaurs (and animals.)
We just did this for fun, but I would expect that these "eggs" could be made in advance of a dinosaur themed party or as part of a dinosaur dig with a group of children.
Overall, it took my kids and I about 30-minutes to mix and mold the eggs, and we waited three days for the eggs to dry. We broke them up again the day after they dried.
From the photo, you can see that the inside doesn't dry all the way through, but the outside is hard as a rock.
Step 1: Materials
- 1-cup all purpose flour
- 1-cup coffee grounds (the ones shown are used because I can't waste coffee)
- 1-cup sand
- 3/4-cup salt
- 1/2-cup water (or less, see Step 3)
- four to five small plastic animals or dinosaurs