hc110 and apx400

Perikles · Feb 10, 2005

Hello.
Any ideas about developing time of an apx400 (new emulsion) in hc110? Cant find any info on digitaltruth.
Thank you!
P.

jim appleyard · Feb 10, 2005

Anchell & Troop, and Freestyle as well, say Dil. B for 6 min. @ 68 degrees F

Ed Buffaloe's time is 9 min @ 70F, Dil. B

And you're right, the MDC does not have a time for HC-110. Odd!

Do a test roll!!!

Perikles · Feb 10, 2005

I will try it..it's strange, since the emulsion changed rodinal times almost doubled, but hc110 seems still the same (hoping freestyle chart is updated).
I will try 12 mins at dilution H...
Thanks a lot
P.

titrisol · Feb 10, 2005

MDC has 6 minutes for APX400 in dilution B @400

Perikles · Feb 10, 2005

yes, but is for the OLD film the emulsion changed in 2002.

titrisol · Feb 10, 2005

I believe that you can estimate the dev time but dropping a leader in the developer, taking the time it takes to become gray (not black) and them multyplying by 5 for a starting point.....

Perikles · Feb 10, 2005

I will try and let you know
Thanks
P.

Perikles · Feb 11, 2005

just tried dilution H (1+64) for 12 min. at 20°C, agitation 5 secs every min and the negatives looks good

BarrieB · Feb 11, 2005

I believe this is known as ' The Watkins Factor ' , many years ago most printing papers had a published ' Factor ' so no matter what developer or dilution you were using you were able to ' Develop to completion ' . I was not aware it applied to films as well, but it seems logical .
Cheers BarrieB.

Perikles · Feb 11, 2005

interesting...but I dont know if watkins factor is related (yes it is a factor of the developer, not of the support, see http://unblinkingeye.com/Articles/Physical/physical.html)
I just took 6 mins as starting point, and wanting some compensation I doubled the dilution and the time, as suggested by Covington (http://www.covingtoninnovations.com/hc110/)

tomorrow I will make contact strips and let you know more

hc110 and apx400

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