In the 1930's Kodachrome was invented by Leopold Godowsky, Jr. and Leopold Mannes, both professional musicians
( "Kodachrome was made by God and Man")
was a saying of the time
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they developed a process whereby a single sheet of film is
coated with three layers of emulsion each sensitive to of the
primary colors of light otherwise know as kodachrome. and developed
the color reveal film ektachrome