These Bulgarian smoke grenades exist in 4 different colours.
White, Orange, Red and Black smoke.
All specifications below came from the manufacterers website : http://www.arsenal-bg.com
Smoke Hand Grenades GH SMK-W(white smoke),GH SMK-O(orange smoke),GH SMK-R(red smoke), GH SMK-B(black smoke) are used:
• for communication and for signaling of territories and sites;
• for creation of smoke-screen (cloud) and temporary cover of materiel and personnel;
• for purposeful diversion;
• for performance of special combat operations.