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==Types of Detection techniques==
===Imaging (main X-rays)===
The use of colorimetric test kits for explosive detection is one of the most established, simplest, and most widely used methods for the detection of explosives. Colorimetric detection of explosives involves applying a chemical reagent to an unknown material or sample and observing a color reaction. Common color reactions are known and indicate to the user if there is an explosive material present and in many cases the group of explosives from which the material is derived. The major groups of explosives are [[Nitroaromatic compound|nitroaromatic]], [[nitrate ester]], and [[Nitroamine|nitramine]] explosives, as well as inorganic nitrate-based explosives. Other groups include [[chlorate]]s and [[peroxide]]s which are not nitro based explosives. Since explosives usually contain nitrogen, detection often is based around spotting nitrogenous compounds. As a result, traditional colorimetric tests have a disadvantage: some explosive compounds (such as [[acetone peroxide]]) do not contain nitrogen and are therefore harder to detect.<ref>{{Cite book |last1=Marshall |first1=Maurice |url=https://www.worldcat.org/oclc/316212529 |title=Aspects of explosives detection |last2=Oxley |first2=Jimmie |date=2009 |publisher=[[Elsevier]] |isbn=978-0-08-092314-7 |edition=1st |___location=Amsterdam |doi=10.1016/B978-0-12-374533-0.X0001-3 |oclc=316212529}}</ref>
==Detection tools==
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