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Both samples were put under infrared light causing the molecules to vibrate in unique ways. these can be charted to determine a sample's chemical makeup. >> so if it's a nylon, it's going to show up as a nylon. if it's an acrylic, it will be a totally different pattern. if it's rayon, it's going to show up as a totally different pattern. >> samples from the van and from dana's clothing were both made from a compound known as nylon 66. to take the comparison one step further, analysts turned to a micro-spectrophotometer. >> that is basically a microscope that measures color. we pass light throu...

Infrared light causing the molecules to vibrate in unique ways. these can be charted to determine a sample's chemical makeup. >> so if it's a nylon, it's going to show up as a nylon. if it's rayon, it's going to show up as rayon. if it's a acrylic, it will be a totally different pattern. >> samples from the van and from dana's clothe were both made from a compound known as nylon 66. to take the comparison one step further, analysts turned to a micro-spectrophotometer. >> that was basically a microscope that measures color. we pass light through a ample and it measures how much light of that is...