Homemade Lava Lamp

The pin promised a homemade lava lamp.  Just water coloured with food colouring and oil and then Alka Seltzer.  The result? Well slightly less impressive than the hype (and the photo on the pin) promised. Also the "when the bubbling has subsided just shake violently and allow to settle and then your kids can use it again" promise didn't work either because the oil now contained dissolved aspirin which left a kind of floating sludge which turned the yellow cooking oil green from the blue water we used.

Boys still thought it was cool though.