In a large bowl, combine the Epsom salt, cornstarch, baking soda and citric acid. Stir the ingredients together using a whisk.
In a separate small bowl, mix together your wet ingredients: water, fragrance/essential oil, and food coloring. Notice I used Galactic Grape. It smells amazing.
Pour your wet ingredients into the bowl with your dry ingredients and whisk together.
The mixture will start to clump a little. Use your fingers to ball up a bit of the mixture to see if it is starting to stick together a bit. If not, you can add a little more water, but be careful.
Take one of your eggs and put a little of the confetti sprinkles in one side or both. Then start tightly packing the bath bomb powder into both sides of the egg.
Make sure there aren't any air pockets - just a small hole is enough to make your bath bomb crumble so really pack the mixture in tightly.
Then push the sides together and let the egg sit on a towel covered with waxed paper for at least 15 minutes.
After 15 minutes carefully pry open the egg to see if the mixture has formed to the mold.
Notes
Precision in Measurement: Accurate measurement of ingredients is crucial for the success of your Easter Egg Bath Bombs. Use a kitchen scale to ensure you're measuring the baking soda, Epsom salt, cornstarch, and citric acid precisely. Even slight deviations can affect the final texture and fizziness of your bath bombs.
Test for Consistency: Before filling all your molds, test the consistency of the mixture by squeezing a small amount together in your hand. It should hold its shape without crumbling excessively. If it's too dry, add a few drops of water at a time until you achieve the right consistency. If it's too wet, you risk premature fizzing.
Gentle Handling: When removing the bath bombs from the molds, be gentle to prevent breakage. Use a careful and slow prying motion to release the bath bomb from the mold without damaging its shape. Placing the molds on a towel-covered surface helps absorb excess moisture and prevents sticking.