CD-3 Chemical, Color Developer 3 Agent [200 GRAMS] CAS 24567-76-8, ECN-2, E-6 por | Jul 19, 2026200 grams of CD-3 powder (Color Developer 3) in plastic amber container. Chemistry used for making E-6, ECN-2 and RA-4. Ensure the water is around 110F for easier dissolving.