Instructions for Volcano Colored Eggs: Mix together a tbsp of baking soda, couple tsps of water and some food coloring. Now, grab your paint brushes and begin painting your eggs. Then pour vinegar it on top of the egg & watch the “volcanic eruption” take place.You can repeat steps 2, 3, & 4 over & over until you’re ready to move onto another egg. Lastly, pat off any excess vinegar or simply let them air dry.