Some clay deposits found in the process of exploring caves exhibit thixotropism: an initially solid-seeming mudbank will turn soupy and yield up moisture when dug into or otherwise disturbed.
Assuming the same $5,000 increase in value, the investor's cash contribution of $5,000 would yield an increase in equity of $5,000 in one year, a 100% return.
Addition of ferromagnetic particles, hygroscopic water-retaining materials, or other materials can yield a hot melt adhesive which can be activated by microwave heating.