DIY is still a pretty big pain, I've tried several different kinds from those pages. I have to give Mathmos and/or Lava-Lite credit, they /do/ have the chemistr

DIY is still a pretty big pain, I've tried several different kinds from those pages. I have to give Mathmos and/or Lava-Lite credit, they /do/ have the chemistry down pretty well. The commercial ones are far more reliable than homebrew.