Old Kodachrome 25, how much exposure?

TheGreatGasMaskMan · Jun 17, 2020

Sometime soon, I'm planning on shooting an old K25 roll and developing it as a bw negative. It's a k14 process, no dx coding, and has one of those super long old leaders.
since there's not a whole lot of information on how to expose expired kodachrome films, how much should I give it?

Note-
the camera I'm planning on using dials down to iso 12, and I have a gossen external meter that goes down to .8

Paul Howell · Jun 17, 2020

Well, as it's K25 and very old I would shoot as low as you go then bracket, don't know how to plan to develop, but HC 110 does well as it produces less fog than other developers.

TheGreatGasMaskMan · Jun 17, 2020

Paul Howell said:
Well, as it's K25 and very old I would shoot as low as you go then bracket, don't know how to plan to develop, but HC 110 does well as it produces less fog than other developers.

Forgot to mention the dev- planning on caffenol

Also, it's a 20 exposure roll, so I don't want to do much bracketing

Paul Howell · Jun 17, 2020

I would go as low as can go, figure it lost 2 stops over the decades, so ISO 6? I have never used caffenol, no idea how much time to develop, wild guess, use the time for Iflord F50? As you have only 20 exposures you might want to shoot, sacrifice one frame to cut into 2 rolls of 10, develop first then decide on your next step. Due to the low ISO, there is a chance that it has not picked up too much fog over the years.

TheGreatGasMaskMan · Jun 17, 2020

Paul Howell said:
I would go as low as can go, figure it lost 2 stops over the decades, so ISO 6? I have never used caffenol, no idea how much time to develop, wild guess, use the time for Iflord F50? As you have only 20 exposures you might want to shoot, sacrifice one frame to cut into 2 rolls of 10, develop first then decide on your next step. Due to the low ISO, there is a chance that it has not picked up too much fog over the years.

one of my friends found some kodachrome caffenol dev times (6 min for k25)

TheGreatGasMaskMan · Jul 6, 2020

Alright, it's been developed and it's in the rinse. Shot it at ISO 6 and got results- it's a bit thin but scanning should be able to compensate. I'm going to have to add shooting and developing kodachrome to my experiment itinerary.

Wallendo · Jul 6, 2020

Somewhere on this thread is PE's description of the Kodak method for removing the Carey-Lee silver layer - although if your film is thin that may not be necessary. My experience developing Kodachrome is that I end up with varying shades of black.

TheGreatGasMaskMan · Jul 6, 2020

Wallendo said:
Somewhere on this thread is PE's description of the Kodak method for removing the Carey-Lee silver layer - although if your film is thin that may not be necessary. My experience developing Kodachrome is that I end up with varying shades of black.

Most of my rem jet just washed off with my stop bath (I just used distilled water), and I used some damp sponges to get the little excess off.

Old Kodachrome 25, how much exposure?

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