ORWO NP27 120 and D-76 Time?

[Kirks518]

Not finding much info out there on the NP27 as far as developing times. I have D-76 available, and have seen times of 7 mins (35mm), 15 mins (sheet), and 18 mins (unknown format). That's quite a variation of time.

Anyone with familiarity have a suggestion? I only have the one roll, and I shot it at ASA 200.

 

[piu58]

I guess NP 27 is not usable after that long time. I got a bunch of rolls some years ago, tehy were from 1988. All of them were heavily fogged.

I used a NP 20 from that area and got at least some kind of images. But fog was present too, iso value and contrast were reduced.

Both films were last produced around 1990.

 

[zanxion72]

From the book Orwo Rezepte, for NP27

Compensating developers:
A03, approx. 8'
R09 (Rodinal) 1+40, approx. 12-13
A49, 12-14

Rapid Developers:
MH28 1+6, approx. 6
E102 1+12, approx. 6
A37, 1-1.5

A49 is the D76, and the times given by Orwo and are for continuous moderate agitation.
However, I have developed a roll of NP20 in D23 1+1 for 18 minutes with normal agitation and had great results. I had also developed a roll in D76 before that and it came out with a considerable amount of fog. This is why my second try has been with D23 (byproducts of Hydroquinone oxidation cause chemical fog).

Hope this helps.
Best,

 

[James1]

In Orwo Rezepte, Orwo 19 is D76, and the development time stated for NP27 in Orwo 19 is around 15 minutes. The Orwo agitation scheme is one inversion of the tank every 15 seconds.

As always, the results you get will depend on storage. I've had perfect results from Orwo film that has been frozen since the early 90s, but also very poor results from film of unknown storage!

 

[Kirks518]

Thanks guys. zanxion72; I saw that, but had no clue which one D-76 was.

I took a guess at 11 minutes, and at first look while it was still hanging to dry, it looks fair. Images are there, but dense, and there is quite a bit of fog. I used the roll for nothing of importance, it was strictly to test focus on a camera.

 

[zanxion72]

Then the film must had been in good condition and it could be usable even at EI 320-400. If you have another try it at higher sensitivity. Also, if you mix your own D76, try making D73. It has two ingredients, Sodium Sulfite and Metol, and due to the absence of Hydroquinone it produces far less chemical fog. The times will be the same as those of D76 with just a tad softer contrast.