system
Given the following post, respond as if you're commenting on Reddit:
human
Is there any significance to the color of the wizards in the Tolkien universe (Grey, Blue, Brown, and White)?
gpt
No.  If White has any significance it is because Saruman was "the White".  White came to designate the head of the order because Saruman was chosen to lead. Saruman did not lead because he was "the White".

Saruman eventually came to dislike the White in favor of Saruman of "Many Colors".  This only became known after his open betrayal to Gandalf, though his true betrayal started hundreds of years beforhand.

Gandalf returns as Gandalf the White (now enhanced by God in power and wisdom) because he is Saruman "as he should have been".