There was only one instance of a repeated lightsaber colour in the OT (Obi-Wan’s and Luke’s original saber were both blue) so for the early years of the EU it was just assumed they could be any colour.
Funny thing is we only see four lightsabers in total in the original trilogy. We have Luke’s first lightsaber that was originally Anakin’s [blue], Luke’s second lightsaber he built after losing the first one fighting Vader [green], Obiwan’s lightsaber [blue], and Vader’s lightsaber [red]. And that’s it. So in some ways it doesn’t surprise me that the amount of lore expanded greatly once the prequels came out.
There was only one instance of a repeated lightsaber colour in the OT (Obi-Wan’s and Luke’s original saber were both blue) so for the early years of the EU it was just assumed they could be any colour.
Funny thing is we only see four lightsabers in total in the original trilogy. We have Luke’s first lightsaber that was originally Anakin’s [blue], Luke’s second lightsaber he built after losing the first one fighting Vader [green], Obiwan’s lightsaber [blue], and Vader’s lightsaber [red]. And that’s it. So in some ways it doesn’t surprise me that the amount of lore expanded greatly once the prequels came out.