- baking soda - citric acid - water - bath fizzie mold - favorite calming essential oil
Take a minute to double check that your Legos or other toys will fit into the center of the ball.
Thoroughly mix together the citric acid and baking soda in a large bowl. Very slowly pour in the water and mix with your hands.
You want just enough water to give the baking soda and citric acid mixture a damp, sand-like consistency that will hold together when squeezed.
Scoop up some of the mixture into one half of the mold-do not pack down, then press your Lego into it, place more of the mixture on top.
Then fill the other half of the mold with all of the rest of the mixture and quickly press the two halves together.