FrankT now has the files and is undertaking restoration.
Cool! I hope FrankT will do running commentary on his procedure of what the particular processes do and how well they do it. With lots and lots example pictures and before/after comparisons! 😃
. . . and I wonder how the scan/restoration looks/will-look compared to this cell displayed the Star Phoenix Art Gallery: Disney (1940) Fantasia - Original Vintage Production Art of Otika¹ and an un-named centaurette:
¹ There are 3 differently drawn, dark centarettes; in order of appearance they are "Otika", Sunflower, Atika; only Sunflower and Atika are identified by name in the Disney script; "Otika" may be a mis-spelling of Atika (courtesy Disney-Wiki) with "Otika" un-named in the actual production. (info from Garrett Gilchrist, Orange Cow forum - Animation Thread)