Well, depending on the creator or master, the colors of a lightsaber tell others what type of fighting style you are. This isn't true all the time, but most of the time.
Green: Shii-Cho
Blue: Soresu
Red or Green: Ataru
Green: Djem So
Any color, but 2 lightsabers: Jar'kai
The unorthodox is using more than two sabers, but that really isn't common, only if the jedi or sith was an alien species that had more than two arms or if it was General Grievous.
The color of your lightsaber could also tell about your emotions, as Yoda would say to his younglings.
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In the Star Wars universe, lightsaber colors are typically associated with the Jedi's strength or specialization. For example, blue is often given to Jedi Guardians who focus on combat, green for Jedi Consulars who are more attuned to the Force, and purple for those who have a balance of both. However, lightsaber colors can also be a matter of personal choice or cultural significance.
Colors enter the world through light. When light hits an object, some colors are absorbed and others are reflected. The reflected colors are what we see, which gives objects their color.
Rainbows have seven colors because sunlight is made up of different colors of light, each with a different wavelength. When sunlight passes through raindrops, it is refracted and dispersed into its different colors, creating the seven colors of the visible spectrum (red, orange, yellow, green, blue, indigo, and violet) that make up a rainbow.
A prism splits starlight into a spectrum of different colors by refracting the light at different angles depending on its wavelength. This causes the white light to separate into its component colors, creating a rainbow of colors.
There are no known colors that no one has ever seen. Different cultures may have different ways of perceiving and describing colors, but the visible light spectrum encompasses all colors that the human eye can potentially see.
black because its absorbs all he colors as opposed to different colors they absorb the colors that they are if that makes any sense