In one method of manufacturing a fluid-filled chamber, two polymer layers are located between two mold portions, the surfaces of the mold portions cooperatively defining a peripheral cavity with first and second regions, an inward extent of the first region exceeding an inward extent of the second region. Since no image is required, only a few transducer elements are required. This invention further relates to a method for oxidative dyeing of keratin fibers, comprising applying such compositions in the presence of an oxidizing agent, for a period sufficient to develop the desired coloration.