a straight chain which absorbs no visible light. Lactone rings can be produced whenever a long chain molecule contains acid functionality on one end, and alcohol functionality at the other. The two ends of the molecule react in a condensation reaction, ejecting a water molecule. To drive the reaction back towards the long chain, pressure, heat or an excess of water must be added. References Popular Science article, November 2005 External links Zubbles home page (archived) Tim Kehoe's web site (archived) Formula for colored bubbles Toy brands Colloidal chemistry