Fill a container one-quarter full of water. We used a small glass jar, but you could use a water bottle.
Fill the rest of the jar (not quite to the top) with oil. My daughter was amazed at how the oil just floated on the water.
Add a few drops of food coloring to the container. Watch as the food coloring falls through the oil and mixes with the water.
Next, add a pinch of salt to the container. The oil will attach to individual grains of salt and sink to the bottom. Once the salt dissolves, the oil will return to the top. This creates a lava lamp like effect.
Once the salt dissolved, my daughter added more salt. We put the cap on the bottle and gently moved it back and forth to mix the oil and water.
We repeated this process with more colors.
This simple science experiment was so much fun to do. Sophia asked so many questions about this process. I love giving her an opportunity to explore and discover about the world around her in a hand-on, fun and meaningful way. These lava lamps have a soothing snow globe effect as well and they are so relaxing to look at.