HP5+5x4/PMK(EDTA) BTZS

[kev curry]

Anyone have developing times and film speed data @ N /N+/ N- to share for this combination in BTZS tubes.

Just to get me going for now.

Help appreciated

cheers

[Shen45]

I will venture to the darkroom now Kev - If I have the EzpoDev file is that what you need?

If not I will try to give you those strange N number things

Steve

[kev curry]

Hi Steve just looking for 'those strange N number things' with speed changes at the various development times if you have them

[Shen45]

Hi Steve just looking for 'those strange N number things' with speed changes at the various development times if you have them

You really should get the ExpoDev

Temp 21C
Dilution 1/2/80

N-2 125 iso 5:45

N-1 160 iso 6:45

N 250 iso 9:15

N+1 500 iso 14:45


if the times are too long or short for you adjust all times by the same percentage and you will have a meaningful set of numbers.

Steve

[kev curry]

Excellent Steve thanks for that. I'll keep you posted.

Cheers
kev

[mandoman7]

My tests for hp5 and pmk, using a densitometer, gave me a 6.5 min. time for N development (no edta). That's quite a difference from many of the published numbers. There are variables in the pH or purity of the water, the chemistry, agitation methods. I wouldn't rely on someone else's number if quality was the desired result.
There are some easy and reliable testing methods that will really tell you what you need to know.

JY

[kev curry]

Thanks JY. I'm well aware of the many variables. I'm just after some numbers for a test drive in BTZS tubes