Developer Temperature

[Annibale G.]

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Hi,

I was just asking mself why some developer mainly the Kodak TMax use as standard deleveloping time 24°C instead of the classic 20°C. What are the differences?

Can I use lower temperature? 22°C or 20°C

How can I find the others developing time at different temperatures?

Thanks

Annibale

[andybarton]

Yes you can use it at lower temperatures

 

Go to digitaltruth.com and look at the Great Big Development Chart on the top left for tipsd

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[fotohuis]

Yes you can but the best preformance of the Tmax developer with Tmax films is on 24 degrees C.

Some other developers are also working on a higher temperature like the CG512/Rollei Low Speed developer: Also 24 degrees C.

 

Most developers are working best on 20 degrees C. Rodinal even better on a lower temperature: 18 degrees C. because with slow agitation and close around 18 degrees C. you will have less grain with this Para-Amino Phenol developer.

 

Always make a time correction according the Ilford/Harman temperature correction table. Within the range of 18-24 degrees C you will normally succeed without too much deviations. Some components are inactive under 18 degrees C and normally above 24 degrees C. the developing time can be too short for a reproducible result and the emulsion is getting pretty soft over 24 degrees C. so that means you have to use a hardener then.

 

Best regards,

 

Robert