in that bucket, sulfuric acid, he's throwing it all over the other employees. >> that is terrifying. >> there's no way to fight against that. >> it's utter chaos in the place, people are trying to run and get away, but it's hard to get away from. >> oh, my gosh. looks like he ripped the shirt off to get away from the acid, and the guy just continues. whatever the dispute is, quite the job, try to work it out. don't attack people. you see the burns, the man who didn't have a shirt on, substantial injuries. >> unfortunately, those are scars that will never go away. >>> from there to another video, about 4:30 in the morning, guys look like they are hugging in the middle of the street. it's not friendly. turning his back, the guy on the right pulls out a concrete slab, smashes him in the head as he turns his back and runs away as he is a safe distance away. the man was arrested shortly thereafter. the victim not id'ed who left in a cab after. they want this guy to come forward to continue to invest gait and bring the other guy to justice. >> that is a definition of a coward. >>> if you'r

what was left was primarily sulfuric acid. in a process called colorimetric testing, he added hydrochloric acid and zinc to the mix. >> as it bubbles through this device, the arsenic will react and form if it's present a purplish violet color. the more arsenic present, the stronger the more purple the color is. >> rod mccutcheon's chemical cocktail made forensic history. the solution turned a deep purple. conclusive proof of the presence of arsenic. the depth of color in the reaction showed that cordelia norton ingested a massive amount of arsenic. the test results on catherine's ashes were inconclusive. nevertheless, their deaths were ruled homicides. and it appeared the sisters got the last laugh. they died before changing their will. >> when they read the will, he found he got nothing. they said he was very distraught, very angry when he left. in new york state, we're changing the way we do business, with startup ny. we've created tax free zones throughout the state. and startup ny companies will be investing hundreds of mil