【How-to】How to make a lava lamp without alka seltzer

Once you’ve made the base, paint it. Wax is less dense than water when melted, so if you only use wax in your lamp, it will float up and stay there. … So, if you’re making 250ml of lava you need about 166ml wax and 83ml perc. You are going to pour the perc into the molten wax to make the lava.