An electromagnetic stylus includes a body, a core and an induction coil. The mixed surfactants are more tolerant of sodium carbonate, allowing greater amounts of sodium carbonate to be used so that the amount of surfactant can be reduced resulting in overall cost savings in the resultant laundry product. The incident light 24 may be directed transversely from the side of the substrate 10 with a narrow band or multiple wavelength source, in which case the code is represented by a spatial distribution of light or a wavelength spectrum, respectively. The dispenser assembly includes a base member and a porous foam pad lower cover to provide padding for a comfortable scalp interface, absorbs the conductive gel to maintain a consistent volume of gel between the electrode base and scalp, and for conducting EEG signals from the scalp of the user to a corresponding electrode locator ring for communication to an EEG monitor.