Diminishing gel compositions are disclosed and described. A diminishing gel composition can include a polymer matrix, a gel-diminishing agent, and a releasable active agent, such as an olfactory agent. The gel-diminishing agent can facilitate a visually noticeable or detectible gradual decrease in volume of the gel composition while in use. The releasable active agent can be released from the gel composition at a rate and amount that is sufficient to produce a desired result, such as an effective olfactory event.
