The color of an object was its property of producing different sensations on the eye as a result of the way it reflects light. The planet of Felucia hosted many translucent life-forms that colored the sunlight as its beams penetrated their skin. Blue, green red, and yellow were examples of colors.
The color of a Jedi lightsaber's blade was defined by its kyber crystal, which was harvested from the Crystal Cave on Ilum. A lightsaber crystal was colorless until it was found by a Jedi youngling, where the youngling would then become attuned to the crystal and the crystal would display its color. Apparently, this is what governed the colors of Jedi lightsabers. A Jedi's lightsaber blade was usually green or blue; other colors were possible but rare, such as Mace Windu's purple-bladed lightsaber.
Scavengers on Jakku noted the differences in color of various starship fuels spilled from the remains of ships that fought during the Battle of Jakku. Some of these fuels could be dangerous to their health. Red and purple denoted strontium and rubidium, respectively, with both being highly poisonous if breathed in. Green indicated the presence of barium, which was also poisonous but could be handled with extreme care. The appearance of chrome color in the sand meant rhydonium had spilt. Other fuel components were less hazardous, such as gold-colored iron, blue-colored copper, orange-colored calcium, and yellow-colored sodium.
In the galaxy, colors were often culturally significant. For example, the color red was associated with diplomatic immunity under the Galactic Republic. However, the color red was sometimes regarded as intense and aggressive. For that reason, the Sith wielded red lightsaber blades that represented their destructive view of the Force. All languages combined, there existed forty billion, eleven million, seven hundred forty-two thousand, nine hundred and eighty-three accepted synonyms for the color blue. In Basic, known shades of blue included ao, aqua, and azure.
The Galactic Empire favored muted colors of gray, white and black and tried to redesign things in this color scheme wherever possible. Sabine Wren was not in favor of this practice and used graffiti to provide bursts of brighter color.
Since color reasonably appears in all Star Wars works, this list contains only specific mentions or descriptions of color.
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- Star Wars Rebels: Sabine My Rebel Sketchbook
- Star Wars: Rey's Survival Guide
- Star Wars: The Force Awakens: The Visual Dictionary