These would likely be from an industrial/chemical firm !! But it would be difficult to guess what it held !! I would suggest looking at the area where yiou found it and see what industry is located there !! Keep in mind that it would not have to be anything like arsenic !! Even cleaning liquids are poison !! And yes,, there are many bottle collectors that specialize in poison bottles !! Let me get a website for you that might help !!