Powdered CD4 shelflife.

Sajmonus00 · Apr 8, 2021

Hello. How long CD4 stays good when stored in dark? Thank you.

Anon Ymous · Apr 8, 2021

I've got some I bought back in 2018 and it doesn't seem that it changed at all. I store it in a small glass jar.

Donald Qualls · Apr 8, 2021

I have some that was stored in my shed (very wide temperature extremes) for about five years, plus another 3-4 years at room temperature before that, and it turned dark, produced a deep green solution when I tried to mix it. The dark stuff settled out of solution over time, but I haven't tested it...

Bronson Dugnutt · Apr 8, 2021

High temperatures, moisture, and oxygen are to be avoided but a well-sealed brown glass bottle would be sufficient to provide several years of shelf life.

Anon Ymous · Apr 8, 2021

I should also add that mine wasn't subjected to high temperatures.

nickandre · Apr 8, 2021

You can also try using Nitrogen to top off the bottle in between uses. Back in the day I kept C41 developer in entirely full glass bottles with plastic caps and it would keep for an exceedingly long time in that form without oxidation.

koraks · Apr 9, 2021

This is what Ron Mowery said to me on the storage of CD4 and other CDx:

I would store in a good brown glass bottle with screw cap. White colored to tan or brown is good, but darker brown is not good. I mix mine, if needed, each time from my bottle. The only one that I think is going bad at this time is the CD6. It is over 20 years old

mtjade2007 · Apr 21, 2021

I have one 100 gram bottle (plastic) bought 30+ years ago. Its color is still light tan. Last time I used it prior to the Covid-19 pandemic it was still as good as new. The label on the bottle shows Zone V, 50 Strafford VT 05070 1988. Looks like I bought it from this company called Zone V. Is there such a company still? I can't find it on the internet.

Randy Stewart · May 4, 2021

mtjade2007 said:
I have one 100 gram bottle (plastic) bought 30+ years ago. Its color is still light tan. Last time I used it prior to the Covid-19 pandemic it was still as good as new. The label on the bottle shows Zone V, 50 Strafford VT 05070 1988. Looks like I bought it from this company called Zone V. Is there such a company still? I can't find it on the internet.

Owing to my declining frequency both with camera and in the darkroom, my DIY color processing has similarly declined. I think my plastic bottle of CD-4 must be about 25 years old, and it is still as good as new, stored in a temperature stable, low humidity, dark environment.

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