At its very core, Star Wars is a fictional and an encaptivating tale in space— a series of joyful, exciting, and thrilling adventures. And what's a good fantasy saga without a mystical sword? They are part and parcel of these story lines: Be it Aragorn's Andúril and Frodo's Sting in Lord of the Rings, King Arthur's Excalibur, or Jon Snow's Longclaw in Game of Thrones.
In Star Wars, the lightsabers help our heroes – and the brutes – on their journeys of battle and self-discovery. They are legendary weapons, individual to their creators, with legacies entrenched in the cosmos' most archaic aspects far, far away.
Colors of Lightsabers
Approximately 4000 BBY lightsaber crystals have been used to denote Jedi's handpicked class. Blue signified Jedi Guardian— the Jedi who used the Force on a more physical level. Green pointed to Jedi Consular, a Jedi who favored reflecting on the wonders of the Force and fought the dark side of his heart. Yellow is denoted to Jedi Sentinel— a Jedi who honed his skills in the balance of combat and intellectual endeavors.
Basically, Lightsaber Color Meanings depend on the hue of the crystal. Most of the crystallites on the Ilum are blue, which is the most common color for the Jedi saber, but sometimes we see green, yellow, and even purple blades; the colors also represent Jedi's close relationship with the Force. Red lightsabers, on the other hand, are chiefly dark sides. They are unnatural at their core because Kyber never naturally grows red. The color is derived from a process called "bleeding," in which the Sith or Dark Sider that drains the Kyber crystal of its light and, in the process, corrupts it. The synthesized crystals favored by dark-side users for their hostile characteristics were loaded with the negative energies of their makers.
In the later years, however, mostly Jedi used blue or green crystals from the Ilum caves depending on individual choice, and then the use of crystals hailing from diverse sources across the globe became negligible. However, individuals on key duties had specific lightsaber color meanings— for instance, all temple wardens used yellow crystals to drive their lightsabers. A few Jedis still used purple and orange crystals until the collapse of the Jedi Order, but they were pretty uncommon and often passed down through the generations. During the Galactic Civil War times, the Galactic Empire forbade trade and acquisition of all lightsaber crystals. Having no more Ilum crystals left at their end, Jedi of the New Jedi Order settled for the use of various crystals and precious gemstones, creating lightsaber blades of different colors.
Some unknown facts
A lightsaber can be black too.
There's only one black-bladed lightsaber, known as the Darksaber. It's a prehistoric weapon that the Jedi had stolen from the Mandalore long back. Strangely, the blade of the Darksaber is shaped like a standard blade; it is slender with an edge, even though slightly bent and the back of the blade is somewhat pointy.
They were even called laser swords.
Not in the Star Wars universe, though, just in George Lucas's early draughts of the Star Wars script. "Lightsabers" is definitely better.
Lightsaber blades were animated.
The initial attempt at lightsaber used lengthy, reflective, three-sided rods. They were spun with the motors inside the holds, which meant that the blades would continuously reflect the stage lights. Not surprisingly, it looked awful, and the graphics were added later. It was then that Lucas concluded that the blades ought to have color, each having lightsaber color meaning—initially, they were just going to be white.
Lightsaber can't slice through everything.
A few substances are resistant to lightsaber blades, so they have often been used to make armory. Cortosis is the most prevalent amongst these, and its primary state actually had the capacity to make lightsabers that touched it short. Sadly, Cortosis is fatal to the touch and thus needs to be honed in order to turn into armor, at which point only light-saver blades can be deflected. Some creatures, such as lava dragons, also have skin that is inherently immune to lightsaber blades.
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