Hydrochloric acid is a chemical most commonly used in cleaning products. According to the National Library of Medicine, hydrochloric acid is a colorless watery liquid with a sharp, irritating odor ...

The claim: A 'massive death plume' is raining down hydrochloric acid after Ohio train derailment A Feb. 13 Facebook post (direct link, archived link) shows a screenshot of a tweet about the Feb. 3 ...