- 1 empty plastic water bottle (and it's better if you take the label off too!)
- Vegetable oil
- Food colouring (use whatever colours you like best!)
- Effervescent tablet (the larger the better)
Step 1: Fill the bottle with vegetable oil 3/4 of the way to the top.
Step 2: Add water to fill the remainder of the bottle.
Step 3: Add the food colouring, about 10 drops or until you are satisfied with the colour.
Step 4: Cut the effervescent tablet into 8 even pieces.
Step 5: Drop one piece into the bottle so that the mixture begins to bubble.
Step 6: Once the bubbling has stopped, add another piece. Continue adding pieces until they have all been added.
Step 7: Tightly screw on the bottle lid. Gently tilt the bottle back and forth to see the lava-like mixture!
Bonus: If you want, shine a flash light under the bottle to see what the added light does!
For more information, see: http://www.education.com/activity/article/Make_Homemade_Lava_Lamp/