Recent content by jmrochester

I recently exposed (at varying EI) and had processed a roll of Royal Gold 25 (Ektar 25), expiration 1995, that had been kept at room temperature as the OP described. I got essentially the same result as he. I can guarantee that the film at manufacture date was not defective. So it would seem...

That may be true of some color neg stocks but not all. As Mr Bill has described in detail here and in another current thread this generalization applies to films that have been manufactured to very tight tolerances.

Just curious: does anyone recall that the OP's question was about still photography with color neg?

The answer to your concern is in the fine print of that document. I'll leave it there.

We're getting far afield from the original topic. How do you know what -- if anything -- is in the other interlayer?

No, they're solubilized by processing chemistry. Calling them "dyes" is a misnomer (of which I was guilty above 🙁).

Carey Lea Silver utilized in some yellow filter layers is an example of a water-insoluble material that is solubilized by processing chemistry. Filter dyes are generally not water soluble -- at least in color films.

As a point of clarification most consumer color films have the AHU on the same side of and nearest to the base below the emulsion layers. (Cine film has a remjet layer on the reverse side.) In that case, washing out a conventional AHU layer is not likely. Of course it's possible that the AHU...

Unusually low freezer temperatures for long term have the potential to cause crystallization of coupler dispersions in color negative films. This scenario is generally not tested by manufacturers, and I would suggest that any temperature below 0F doesn't accomplish much and may be detrimental...

Dr. Weissberger was a well-respected and prolific scientist in the Kodak Research Laboratories. He passed away forty years ago at 85.

My guess is that these large spots are from coupler dispersion globules whose size are well outside the standard deviation of normal coupler dispersions. They represent an opportunity for better process control.

🤣👌

Drew, I was involved with the design and/or development of EK color neg films for about fifteen years beginning with Ektar 25. Ektar 125 was developed at the same time but was distinctly different from a compositional point of view. Because of some issues Ektar 125 was quickly succeeded by...

Ektar 100 evolved from Ektar 125, not Ektar 25. The latter had unique structure and components not shared with any other Ektar.

Ahhh, sorry about that. I didn't look there.