In Star Wars a new Hope Luke's lightsaber has a light blue, however in the prequel films the same blade is a dark blue. Here's the blade in A New Hope ![enter image description here][1] and here it is in Revenge of the Sith ![enter image description here][2] Is there an in universe reason for this change in colour or is it simply a byproduct of the newer techniques of making the lightsabers? [1]: https://i.sstatic.net/1O3ba.jpg [2]: https://i.sstatic.net/kcEjs.jpg