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.