Ilfotec-HC 1+47 time for classic 100 films?

[eumenius]

Hello friends,
I got myself a bottle of Ilfotec-HC, and now I'm puzzled - neither its datasheet nor Massive Dev Chart don't have times for its 1+47 one-shot dilution and some kind of classical-style 100ASA films like Foma, Forte or EFKE. The tables end on 1+31 for most of the films, and I want to use 1+47. My guesstimate of starting time is about 11-12 minutes, that's how FP4+ should be developed. Am I correct? Does anyone use HC and, say, Fomapan 100 together?

Cheers from Moscow,
Zhenya

 

[TimH]

Hello eumenius,
Take a look at the dev times for HC-110. They are usually a little bit shorter than the times given for Ilfotec HC, but it's a good starting point. The dev time for 1+63 is about twice as long as 1+31, so multiply the standard times by 1,5 for 1+47.
I use Ilfotec HC a lot, but only once in combination with Fortepan 100, so I can't give you the exact times...

 

[eumenius]

Aha, thank you - but what prevented you from posting here your time for Fortepan 100, eh? I tried to understand the HC today by quick and easy way - shot a pair of 4*5 sheet of Fomapan 100 @ASA100, and tried to develop them in HC 1+31. First one was there for 7m30s. WOOOHOOO! The density is amazing, thanks to hydroquinone. I think it was a push to ASA400, at least The second sheet was developed for 6 minutes at 20 Celsius degrees, and it looks on a "juicy" side - a tad too dense and contrasty, but useable. I think the right time is 5 minutes. And with 1+47 it should become 7m30s, right?

Hello eumenius,
Take a look at the dev times for HC-110. They are usually a little bit shorter than the times given for Ilfotec HC, but it's a good starting point. The dev time for 1+63 is about twice as long as 1+31, so multiply the standard times by 1,5 for 1+47.
I use Ilfotec HC a lot, but only once in combination with Fortepan 100, so I can't give you the exact times...

 

[Donald Qualls]

It's probably a perfectly fine starting point to assume 1+47 requires 50% more time than 1+31 on the same film and at the same temperature. HC-110, which is extremely similar, is pretty nearly linear on time vs. dilution from 1+31 up to 1+79, at least.

 

[TimH]

Aha, thank you - but what prevented you from posting here your time for Fortepan 100, eh?

Well.. I eh.. don't remember... :rolleyes: I think it was somewhere around 6 mins.
7m30s with 1+47 should be fine.