The 5/6/13 repeat Bones episode titled "The Diamond in the Rough" showed Brennan using a chemical test to determine the presence of lead acetate in a ballroom dancers costume.
Sodium Rhodizonate is a chemical test used in forensic work, specifically in reference to firearms, to determine the presence of lead in many forms. The gaseous vapors, the particulate, and any bullet lead wipe determine that a shot was fired and may all help to distinguish a muzzle to target distance in shooting cases.
The further the distance the muzzle of a gun is away from the object shot (the target) the larger the circumference of the circle of gas and particles. There is a distance where these drop off and are no longer visible. A comparison of the pattern size and distribution will determine a range of distance if it within the range where this information is captured.
The lead wipe will tell you that it is a bullet hole.
Nitrites are also determined through a chemical test called the Griess test. These patterns, which are created by unburned or partially burned smokeless powder, also help to determine muzzle to target distance.
Speaking of distances, I think I will keep mine in reference to comment on the dancing of Bones and Booth.
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