Abstract: A vessel for the containment of food or drink produces a chemiluminescent reaction when activated to provide an enjoyable effect for the user of the vessel. The vessel has inner and outer walls and floors with a space therebetween, and includes a chemiluminescent fluid within at least the floor space. Another chemiluminescent fluid is contained separately within a toroidal tube in the upper or lower rim of the vessel. The vessel and tube are preferably formed of a flexible and translucent plastic. Thus, when the rim is flexed the toroidal tube is compressed, causing the fluid contained therein to rupture a thin membrane separating the volumes of the tube and wall or floor space and allowing the fluid contained within the tube to flow into the space between the two walls and floors to mix with the other chemiluminescent fluid and thereby produce an interesting and pleasing glow from the vessel.