Glycin stand development

[Alan Johnson]

Thanks to Lachlan for that, a much better explanation than I was going to put up based on Crawley's BJP article of 6 Jan 1960.

 

[Alan Johnson]

Still mottling with FX-2nm (no metol) at 1+1+18.




Remains to be seen if mottling can be avoided by an increase in concentration without too much reduction of edge effect.

 

[Raghu Kuvempunagar]

I believe you're already presoaking. Would a longer initial agitation help?

 

[Alan Johnson]

I believe you're already presoaking. Would a longer initial agitation help?

Done. A test with a 3min prewet with 5 inversions each 30s, plus at start 1 min of continuous agitation, plus 5 inversions each 10min for 60min 24C:



The low glycin concentration gives good edge effect. Uniformity is better with this schedule of inversions.

 

[Raghu Kuvempunagar]

Done. A test with a 3min prewet with 5 inversions each 30s, plus at start 1 min of continuous agitation, plus 5 inversions each 10min for 60min 24C:



The low glycin concentration gives good edge effect. Uniformity is better with this schedule of inversions.

Looks great! Would reducing the temperature to 20 C help further?

 

[John Wiegerink]

Looks great! Would reducing the temperature to 20 C help further?

Raghu,
I thought I read somewhere that Glycin, as a developer, like warmer tempts, but I could be wrong. Not saying it wouldn't be worth trying cuz you never know until you try.

 

[relistan]

@Alan Johnson This is a great thread! Sorry I missed it when it began. I found when testing two bath developers that some formulas (PQ and PC) could end up with quite strong adjacency effects (though not as strong as some you've shown) on modern films. I believe this is due to the exhaustion happening in the (fresh) second bath, where there is very little to regenerate the developing agents. I wonder if a final step with the glycin developer where you put it into e.g. a carbonate bath will increase the adjacency effect potential here.

 

[Raghu Kuvempunagar]

John, you are probably right. I didn't think about this aspect of Glycin only developers. FX-2, which has Metol apart from Glycin, is to be used at 68 F according to Haist Vol 1.

 

[John Wiegerink]

John, you are probably right. I didn't think about this aspect of Glycin only developers. FX-2, which has Metol apart from Glycin, is to be used at 68 F according to Haist Vol 1.

Like I said, "I could be wrong".

 

[Alan Johnson]

@relistan, thanks, I will measure the pH of the working solution next time I use it.
@Raghu, the negatives are already rather thin at 24C for 60m so it would be needed to extend the development time at 20C and for the time being I will keep to 60min out of preference.

 

[Alan Johnson]

The next film was processed as in post 79 of Mar 4th. I regard this as satisfactory for producing the edge effects (adjacency effects, Mackie lines) visible in some areas of some pictures.



The type of believed low iodide film used dates to Adox KB17 then Efke 50 1952-2012 ,Adox CHS100 II 2013 -but this seems to be the first record of the use of a low concentration of glycin to produce these effects. Crawley 1960-61 obtained edge effects using potassium iodide in FX-1.
With other developers there have been comments that reduced agitation leads to increased microcontrast, pehaps this can be seen here:

 

[Alan Johnson]

More edge effects with CHS100 II taken with a P&S camera and semi stand developed in the FX-2nm glycin developer (post 79 mar 24th):





Light lines are visible on uniform grey areas next to black areas.
People in dark clothes on a lighter uniform grey background can get a faint halo.

The negatives produced at 1hr semi-stand development are grey and thin but since they scan OK I have not tried to make any further improvement.

 

[Raghu Kuvempunagar]

Great demonstration of edge effect, Allan.

Incidentally, on FB I saw today, a scan of 8x10 Fomapan 100 developed in Jobo Alpha which shows edge effect upon careful viewing. It is not as visually prominent as in your examples, but still there. One of the ingredients of Jobo Alpha is apparently related to colour developer CD4. This made me wonder if your MeCD4 developer produces edfe effect. Have you noticed in any of the films you tested?

 

[Alan Johnson]

I had a look through the pics labelled Thames Path 2 to 7 on Aviphot 200 developed in MeCD4 but cannot see any edge effect, eg:



I have only got edge effects to the extent illustrated above in previous posts, which effects are I hope not too unsightly, ( in fact they are usually hard to see at all ) with one film , Adox CHS100 II (a descendent of the Efke film I believe and probably low iodide) in the dilute glycin developer.
@relistan has mentioned that he has seen them with at least one film but I don't think he pursued it.

 

[Raghu Kuvempunagar]

Thanks Alan for checking.

 

[Alan Johnson]

Results from stand developing for 90 min instead of the previous 60min (post 79, Mar 24).The negatives are closer to normal density.
In some areas light/dark lines can be seen next to dark/light grey areas at high magnification.





The heritage of the 1952 thin emulsion low iodide films Adox KB 14, 17, 21, giving reduced light scattering and high edge effects can be seen.