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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

and here it is in Revenge of the Sith

enter image description here

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?

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Seriously, I cannot make out any differences in those lightsabers, blue is blue. The explanation that the technique for making those effects changed is probably the most likely (though, good will keeps me from downvoting for now). –  Sonny Burnett Jul 9 '13 at 15:59
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As a side note, colors on an object can change based on the lighting in a room. Colors from a light source are subject to the same effects. Additionally, one presumes that the color of the plasma would be effected by the temperature of the blade and the atmosphere in the room - different gases have different spectrums. Given that it also lists crystals on that page.... perhaps, in universe, it could just be the age of the saber? Out of universe, it probably is just the technique... –  Clockwork-Muse Jul 9 '13 at 16:09
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Close Vote - There is no major difference in lightsabers. –  Ankit Sharma Jul 9 '13 at 16:30
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Anakin's lightsaber has been sitting in Ben's dusty hope chest for 20+ years. Its battery is a bit flat. –  Nobby Jul 9 '13 at 19:26
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The close votes seem to indicate that most people don't see a major differences –  Liath Jul 10 '13 at 8:11

1 Answer 1

up vote 7 down vote accepted

As @Jared points out in the comments, differences in the color of lightsabers between the Star Wars episodes, can be attributed to post-production. There is no canonical (in-universe) reason for these color differences.

For example, and taken directly from the question that Jared linked to... It's Green ...before the last edited release, it was made green. More than likely, if you are watching a copy of Star Wars that was released before 2004, you will find color differences from scene to scene.

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