“The Force guided their selection, finding a crystal that matched them as Jedi. To those not meant to receive it, the crystal was cold to the touch, but those the crystal chose would hear its "music" and "harmony," becoming attracted to it.[10] Crystals lack color before they were chosen by a Jedi. Once chosen, most lightsabers became blue or green, though other shades were created in some instances, most notably Mace Windu's purple blade, the yellow blades of the Jedi Temple Guards, the black Darksaber, and Ahsoka Tano's white lightsabers.[4][10][12][9] The resulting crystal and blade color was decided through shifting to match the nature of the bonded owner.[13]”