Here's what we know about the appearance:
* Descriptions from ancient sources: Accounts from the time often mention a "bright flame" or "fiery stream," suggesting a bright, possibly yellowish or orange, fire.
* Likely ingredients: The composition of Greek fire included materials like petroleum, sulfur, and possibly quicklime. This suggests a fire with a strong, luminous flame.
* The purpose: The primary function of Greek fire was to intimidate and burn. A bright, visible fire was essential for this.
So, while we can't say for sure what exact shade it was, the consensus is that Greek fire was a very bright and intense fire, with a color likely falling somewhere in the range of yellow, orange, or even white.