A toner includes a resin and a colorant; wherein the toner is obtained by carrying out a step of salting-outfusing resin particles and colorant particles in a water-base medium, the toner satisfying the following relationship: 0. The substantially flexible article includes a base having a lower end, an open upper end with an object opening extending therethrough and a decorative border extending outwardly from the open upper end of the base. For this purpose, the heat-exchanger tube is to be cut to corresponding lengths and provided with corresponding end pieces.