Minol (pronounced mine-ol) is a military explosive developed by the Admiralty early in the Second World War to augment supplies of Trinitrotoluene (TNT) and RDX, which were then in short supply. The aluminium component in Minol significantly prolongs the explosive pulse, making it ideal for use in underwater naval weapons (e.g. sea mines - for which it was developed - depth charges and torpedoes) where munitions with a longer explosive pulse are more destructive than those with high-brisance. Typically, four different Minol formulas were used. All percentages shown are by weight: