08:42 May 8, 2018
Additional features contemplated herein include use-up indicators or use cues. For example, in one embodiment where the volatile active is dispensed onto the interior surface 232 of the sleeve 106, an ink is provided within the sleeve 106 that may appear or disappear to indicate when the volatile active has completely evaporated therefrom. Combinations of appearing and disappearing inks are contemplated to create more complex features upon the application and gradual emanation of the volatile active from the dispenser 100. Other use-up cues could be employed, including, for example, a liquid/gel vessel that is peeled to activate, inks that use capillary action or absorption that activate upon peeling or pressing them together with an absorbent layer, a dial to set a date, or an area to write the date when activated, etc. | 
