Chlorine

Douma

 * DIFFERENT STAGES OF COLOUR OF BED PLUS AUTO-REFRIGERATION INDICATE CHLORINE WAS USED IN DOUMA - FEIT OF FAKE, May 2, 2018

Chlorine properties

 * What is Auto-refrigeration? - Chlorine Institute, February 10, 2015 (video)
 * CHLORINE - FOR DUMMIES - Michael Kobs on Twitter, May 2, 2018

Signs and Symptoms

 * Alleged Chlorine Attack Checklist "When another attack with chlorine gas is reported in Syria, it might help to check the evidence. This page is intended as a resource for that. It's a very basic start for now." (remains that way years later)