Abstract: The color-intensity of exposed and developed Kodachrome color film in the form of color transparencies or continuous strip such as movie film can be reduced by treating selected areas or all of the emulsion side of said color film with an aqueous solution of a dichromate salt acidified with an inorganic mineral acid or formic acid. Any undesirable alteration in color tone is minimized by including a soluble salt of nickel or cobalt in said aqueous solution. The reduction in color-intensity is a function of time and/or acid concentration.