It was an actual weapon used by the Byzantine Empire, which controlled Greece since Theodosius (Roman Emperor) and soon before the fall of Constantinople. After such success alike substances made by other empires were called Greek fire too. Greek fire was a very dangerous weapon for the mortals that used it, and for the enemies. There were two types of greek fire. The first one was a mixture of chemicals. The second was made by reflecting light off many polished shields (metal) or mirrors. Archimedes was the one who supposedly made greek fire with mirrors. Mythbusters proved this can be done on their show. The chemical Greek fire was a lot more dangerous to make. Archeologists still haven't yet found the recipe for it due to the fact that it was a well kept secret. Even the different people who assembled the concoction only knew certain ingredients not all.
Greek fire burns green and can be made used as bombs. Greek fire can also burn underwater as shown in The Last Olympian when Percy goes to Poseidon's underwater palace. Greek fire is described as a swirling green liquid that explodes if dropped on the ground and the container is broken. It is also used as a decoration for Hades' cabin at Camp Half-Blood.
Charles Beckendorf used Greek fire to blow up the Princess Andromeda, in order to slow down Kronos on his invasion of Mount Olympus. Percy escaped, but Beckendorf sacrificed himself. Later, the Hephaestus campers used Greek fire to defend the Holland Tunnel during the Battle of Manhattan. Later, before Percy battles Hyperion, he is hit by a Greek fire bomb as he crosses the water. It as no effect, however, as he opens his palm and sucks up the flames.
Luke, Thalia, and Hal create a vial of Greek fire using ingredients found in Hal's room. They are successful in creating the deadly fire and Hal uses it to destroy the Leucrotae evidently causing his death and allowing Luke and Thalia to escape.
- Pitch from old torches
|Personal Weapons:||Riptide | Annabeth's Knife | Backbiter | Frank's Spear | Hazel's Spatha | Katoptris | Nico's Sword | Thalia's Spear | Aegis | Maimer | Kronos' Scythe | Ivlivs | Master Bolt | Poseidon's Trident | Sword of Hades | Reyna's Spear | Hades' Staff | Juno's Gladius|
|Magical Items:||Annabeth's Yankees Cap | Helm of Darkness | Keys of Hades | Flying Chariot | Golden Apple | Greek Fire | Hermes' Multivitamins | Leo's Magical Toolbelt | Nectar and Ambrosia | Pandora's Pithos | Winged Shoes | The Golden Fleece | Stygian Ice Whistle|
|Spoils of War:||The Minotaur's Horn | Medusa's Head | Kampê's Scimitars | Nemean Lion's Pelt | Gorgon Blood | Cornucopia|
|Items:||Camp Necklace | Chameleon Armor | Daedalus' Laptop | Golden Drachma | Mark of Athena | The Pax | Video Shield | Wristwatch Shield | Golden Mango | Sibylline Books|
|Blessed Metals:||Celestial Bronze | Imperial Gold | Stygian Iron|