arsinic
In the 60’s the mole, mouse and rat bait of choice was Poison Peanuts with powdered arsenic. One brand was Sweeney’s Poison Peanuts which don’t have a peanut covered in arsenic today. They always ate the bait and died unlike the current pellets that they often let just lie in the hole. One thing my parents always drilled into my head was to never eat peanuts that I found somewhere ever. This wasn’t just for their house. The peanuts were covered in a pink or green powder.