The invention is directed to a two-part hair cosmetic for hair dyeing or bleaching which includes a first agent containing an alkaline agent and a second agent containing hydrogen peroxide and a squeeze container for discharging a mixed solution of the first agent and the second agent. Respective detectors can be coupled to the bases as required in a specific installation. Multi-layer wiring structure can include a wiring layer disposed in a M2 wiring layer horizontal track and a M2 wiring layer vertical track.