Rainbow water are pools of liquid ranging in color and opacity from clear to pitch black. Such mystery fluids are quickly categorized under the umbrella of rainbow water when a thin, wavering film of seven colors can be seen on the surface.
Across the waste small deposits of the stuff can be found surfacing from beneath Ava's crust at any time. Because of the constant heat in most areas, the pools dry up in a moon or two, only leaving the thin translucent rainbow film in its place.
A rainbow fountain occurs when a pressurized blast of rainbow water spews forth in a geyser all at once, much to the dismay of anything living nearby.
Rainbow water is a known main ingredient in the production of burn juice a chemical compound drink for increased fervor in fights with potent side effects.