Analysis of information sources in references of the Wikipedia article "E-4 process" in English language version.
Color IR film has one drawback. It is not readily processed because it requires the old E-4 chemistry.
Eastman Kodak no longer offers processing for E-4 films such as Ektachrome Infrared and Kodak Microphotography color-slide films. However, there are more than a dozen independent labs in the U.S. that offer this service.