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warshawlawThe 1953 set involved the creation of actual paintings from photogaphs as source materials. Flexichrome involved using a dye and paint kit from Kodak to tint an existing photograph. The degree to which the layers of dye and paint were placed over the image dictated the degree to which the image looked "cartoony". A thin layer of pigment would merely tint an image; a lot of pigment would create a painted look. Flexichrome is out of date but kits can still be found for sale on ebay.
BTW, one of the more amazing collectibles I ever saw was the original hand-tinted images used to produce all the lobby cards from Gone With The Wind.