Abstract: The currently available artificial nails swell as a whole and undergo deformation, which damages the commercial value thereof. Moreover, they suffer from another problem of not evenly glowing as a whole due to the occurrence of some non-glowing spaces. In an airtight hollow container having a roughly crescent-shaped cross section and having light-permeability and flexibility, therefore, a space free from capillary action is ensured at the inside of an area joining the lower wall and the upper wall. Then, one of two kinds of compositions, which show chemical luminescence when mixed together, is packed in a breakable glass ampule in the airtight hollow container while the other composition is packed outside the glass ampule in the airtight hollow container.