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The researchers then tried to develop the latent prints at timed intervals by employing several methods, including the use of lasers, alternate light sources, iodine/silver transfer, cyanoacrylate fuming (commonly referred to as "glue fuming"), regular and fluorescent powders, specially formulated powders, regular and fluorescent magnetic powders, liquid iodine, RAM, ardrox, and thenoyl europium chelate.
The gas mixture expands, uniformly coating all exposed surfaces (the evidence), thus depositing a thin film which adheres to, or chemically reacts with, the print residue making it visible to the unaided eye or under alternate light source (ALS) or laser excitation.
These items are used at outdoor crime scenes to construct tents or to fabricate blackout areas in order to search for fiber evidence with an alternate light source.