77 consisted of around 225 grams (7.9 ounces) of white phosphorus, an impact fuze and a tin casing.
Once the grenade exploded, the contents (i.e. the white phosphorus) scattered and ignited as soon as they touched the air.
However, these were produced and used in Canada until the 1950s, for the quality and manufacturing of them was better than found in Britain.
77 smoke grenade could also still be found in Dutch army manuals up to the fifties, coded as "C-hgr Nr 77", (chemische handgranaat nummer 77) indicating its use up to that decade in Western Europe.
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