Abstract: A device 2, 102 for streaking hair by use of a streaking dye includes a base plate 4, 104 which can be placed against a person's head to serve as a support for a hair-"passee" 24 to be treated. The device 2, 102 further includes a perforation-pattern plate 10, 106 which can be laid on the base plate 4, 104 and thereby on the hair-"passee" 24. Perforation-pattern plate 10, 106 has a finished pattern of arbitrary geometry and on which the streaking dye can be deposited. The base plate 4, 104 and the perforation-pattern plate 10, 106 are approximately rectangular, each comprising a respective concave side 12, 120 and 14, 124 configured to be placed against the head. The base plate 104 and the perforation-pattern designed as an intermediate plate 106 are connected to each other by a film hinge 112. At its side 114 opposite the base plate, the intermediate plate 106 is connected by a further film hinge 116 to a cover plate 108.