Jar of Cloud Residue

 is a miscellaneous item in the Fallout: New Vegas add-on Dead Money.

Characteristics
Cloud Residue is what settles from the toxic gasses of Sierra Madre. It is a dark red color. You can collect this. This may not be true for everyone, but if shot with a shotgun, the item will make a breaking glass noise and will disappear.

Uses

 * Ghost Vision can be crafted at active hot plates, needing only one jar.
 * Can also be used to craft poisons of varying effectiveness at hot plates, assuming your Survival skill is high enough.
 * May also be used to make a Sierra Madre Martini once acquiring the recipe from Dean.
 * Can just as well be used at campfires.

Locations
This is a list of fixed non-random places where you can find.
 * Walls of buildings in Sierra Madre.
 * On the street floors of Sierra Madre.
 * One jar can be found in the entrance of the Abandoned BoS Bunker, located on a corpse.
 * The chemistry set in Abandoned BoS Bunker spawns one every day (25 science needed).