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Discovered that the sweatshirt was made up entirely of acrylic fibers. palenik could find no acrylic fibers on vincent holmes' shirt, but he did find some on william buck's shirt. but were these fibers from the sweatshirt? most clothing isn't dyed with just one color. usually it takes a combination of colored dyes to get just the right shade. to identify the chemical makeup of the blue fibers, palenik placed them on a plate of silica gel and dipped them into a solvent. >> the solvent mixture travels its way up the plate. it starts to separate the dyes into individual components. sort of a grat...

>> under a microscope palenik discovered that the shirt was made up entirely of acrylic fibers. palenik could find no acrylic fibers on holmes' shirt, but he did on william buck's shirt. but were these fibers from the sweatshirt? most clothing isn't dyed with just one color. usually, it takes a combination of colored dyes to get just the right shade. to identify the chemical makeup of the blue fibers, palenik placed them on a plate of silica gel and dipped them into a solvent. >> the solvent mixture travels its way up the plate. it starts to separate the dyes into usual components. sort of a g...

Most contain three or four color mixtures. these fibers contained seven. and the colors and the composition were identical in both samples. this meant the blue acrylic fibers on william buck's shirt came from the killer's hooded sweatshirt. >> he was wearing either that shirt, or just by pure dumb luck, he was wearing an absolutely identical shirt to that one. >> finally, investigators swabbed about the neck of the sweatshirt and found microscopic skin cells, possibly from sweat. the dna profile of those cells matched buck's genetic profile. william buck was arrested and charged with first-deg...