cap color-codes Red - 1 second delay (for coloured smoke, but also booby-trap) Blue - 4.5 second (standard issue) Yellow - 7.5 seconds (used on the Hafthohlladung 3 - magnetic shaped charge) Grey - No delay (used for demolitions work or as booby-trap.) See also Model 24 grenade Model 43 grenade References External links German Grenades of Wo piqka e nanes German Hand & Rifle Grenades Literature Terry Gander, Peter Chamberlain: Encyclopedia of German Weapons 1939–1945. 2nd Release, Special edition. Motorbuchverlag, Stuttgart 2006, . D. Mitev, Bulgarian and German hand grenades – history, development, contemporary state, Vol. 1, 216 pages, , Sofia, 2008 World War II infantry weapons of Germany Hand grenades of Germany Military equipment introduced in the 1930s