The latest restoration of The Wizard was done from a 1939 Nitrate print "and scanned digitally at 8K resolution":
http://thefilmstage.com/features/wiz...ration-report/
The earlier restoration was done from a fine grain master that was duped from the original negative in 1960, the original negatives were lost in a fire in 1970.
http://www.theasc.com/magazine/dec98/wizard/pgs1.htm
To say the color from this old film is amazing would be a major understatement!