Crime scenes often have powder residue at crime scenes. Investigators have to determine what powders are by smells, sights, texture, and chemical reactions. The class got to look at all the different powders, compare & contrast, smell, and we viewed what chemical reaction happens when each powder was mixed with water, vinegar, or iodine.
Notice the crime scene left all over on the floor & background. Ha! Sorry we had not cleaned up just yet...
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