Hi, I have a bottle that I've never been able to find anything on. It's emerald green, and an 1880's-1890's oval druggist-type bottle. It's embossed in a slug plate, The Rob't Nesbit Ricin Co. Philada. I know ricin is one of the most deadly poisons. There aren't any bumps or lines to make it an obvious poison bottle. It looks like a medicine. Anyone know anything about it?