Chemical aberration.
You can tell that its 35mm film by the granularity of the picture, digital doesnt have the same grain due to the differences in processing. Digital has noise patterns instead which look different.
Kodachrome and Agfacolor both rely on film coated with several layers of seperated emulsion, (agfa differs in that it has color couplers in between emulsion layers) the layers can leech into each other either from a production error or over time with older filmstock.
You can tell its artificial simply by comparing the saturation to the surrounding scene, a simple error in development nothing more.
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