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Amido black has long been used on laboratory slides to enhance the contrast. it also reacts positively to the protein in blood. with nothing to lose, forensic scientist pat warrick took the fbi's suggestion and soaked the bed sheet in the amido black solution. >> none of us believed in a million years that we were going to get anything out of this because the moment the sheet went into the amido black solution the first time, it turned completely blue. >> but to the trained eye, something did start to appear. >> we just couldn't believe it. you know, here we have a section of fabric, this shee...

>> it was beautiful. i didn't expect this or i didn't expect it to be that clear, but details are suddenly just the hdtv analogy. they were popping off the screen that you did not see before. i mean, you could see formations, but you weren't seeing the details. and now all of a sudden, you were seeing those details. >> and there was a remarkable amount of detail. >> here we have pretty much half of a hand from the fingers all the way down to the base of the hand that's in view that is readily visible. so, we had just a tremendous amount of information as far as doing latent print examination o...

Worked. >> it was beautiful. i didn't expect this or i didn't expect it to be that clear, but details are suddenly just the hdtv analogy. they were popping off the screen that you did not see before. i mean, you could see formation but you weren't seeing the details. and now all of a sudden, you were seeing those details. >> and there was a remarkable amount of detail. >> here we have pretty much half of a hand from the fingers all the way down to the base of the hand that's in view that is readily visible. so, we had just a tremendous amount of information as far as doing latent print examina...

Amido black has long been used on laboratory slides to enhance the contrast. it also reacts positively to the protein in blood. with nothing to lose, forensic scientist pat warrick took the fbi's suggestion and soaked the bed sheet in the amido black solution. >> none of us believed in a million years that we were going to get anything out of this because the moment the sheet went into the amido black solution the first time, it turned completely blue. >> but to the trained eye, something did start to appear. >> we just couldn't believe it. you know, here we have a section of fabric, this shee...