Old Color Film Processes

Yezishu said:

Everyone here is incredibly knowledgeable! May I ask a related question? What type of color coupler was used in the early ECN-1 process—was it CD-3, or something else?

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No. As far as I know, ECN-1 was based on CD-2. Interesting detail is that the modern process ECP-2 for print film is also based on the older CD-2 developing agent.

Samu said:

As far as I know, ECN-1 was based on CD-2

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Based on what source? As far as I know, it certainly wasn't that, and thus would have either been CD-1 or CD-3.

koraks said:

Good question - I don't know! I'm sure you've searched for it as well as I have, and found...nothing. Well, some speculation, but nothing firm.
Perhaps @Rudeofus or @Lachlan Young knows.

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I find it quite puzzling, too; Why not a google with an immediate answer? ECN-1 is not a rare process.....
I only located some older books and papers. These mention that Eastman Color Negative Safety Film, Type 5248 utilizes Kodak SD-30 as its color developer—which contains CD-3—while Eastman Color Print Safety Film, Type 5382 uses Kodak SD-31, containing CD-2. However, I still dont know whether this corresponds to ECN-1/ECP-1 process or not.

@laser (Robert Shanebrook) might be able to source that information for you if he is still active on here.