Dust of Inspection

When a handful of this powdery, light gray sand is spread over a surface, such as the lid of a box, the dust and the surface become transparent, allowing inspection of what lies underneath. The effect penetrates up to two inches of non-metallic material. The dust does not create its own light source; ambient light and the user's own vision simply work the same as when looking through a hole. Infravision and ultravision function normally. A typical vial contains enough dust to cover a palm-size circular area, about four inches across. The dust can be reused any number of times. Laying down a thin sheet of paper or fine silk makes this easier. Note: the air around the dust must be calm or it will be blown away.