complete failure with e76

[RalphLambrecht]

i converted the id11d76 formula into a pc formula by replacing m with p and q with c, but after2 ok films and black test leadsrs,i got no more develop,ent ay all.the films are totally blank:nothing. i know, i did not account for any change in super additivity, but how can i fix ths

 

[Keith Tapscott.]

Ralph, why have you done this? Ascorbic acid devs are notorious for short life and Patrick Gainer's PC-TEA and perhaps Ryuji Suzuki's formulas are about the only stable Vit-C derivative developers I can think of.
Stick with plain D-76/ID-11 or try something more exotic like Pyrocat-HD.

 

[Neal]

Hi Ralph,

Why not compare the D76 formula with those of Patrick Gainer? As I recall, he used a high ration of C to P and using it as the "B" developer component and the preservative at the same time. I never tried it.

Neal Wydra

 

[albada]

Ascorbic acid devs are notorious for short life <snip>

Indeed. The problem is called the "Fenton reaction" wherein trace amounts of iron in the developer destroy all the ascorbate. The only work-arounds I know of are (1) use Kodak XTOL, or (2) use home-brews as one-shot. Personally, I wouldn't trust a home-brew PC working solution that's over a couple of hours old unless it has an iron-chelator in it.

Mark Overton

 

[Gerald C Koch]

Ascorbic acid developers are stable if a chelating agent is used to inactivate any Iron (III). It has been my experience that the Ryuji formula works quite well.

 

[RalphLambrecht]

i think, that's it .the heating rod in y kettle is of copper. can you suggest a chelating compound and a quantity?

 

[eclarke]

Or give this a try..

Germain's Finegrain *
makes 1L*

750 cc. Water*
7 g. Metol*
70 g. Sodium Sulfite*
7 g. Paraphenylenediamine*
7 g. Glycin*
Water to make 1L*

Use full strength


This may start a chorus of replies making comparisons to Edwal 12. I have developed around 3000 sheets in this stuff now and it's my first choice with tri x, tmx, tmy, hp5, efke ir and anything else I can throw at it..Cheers, Ec

 

[Gerald C Koch]

The iron contamination usually comes not from the water used but from the chemicals like sodium sulfite used in the formula. DS-10 uses salicylic acid and TEA and these are probably the easiest to obtain. You can't use just any chelating agent as some like EDTA encourage the Fenton reaction. For 1 liter of solution use 1g of salicylic acid plus 10 ml of TEA. Salicylic acid can be obtained from most compounding pharmacies. It is not expensive.

 

[albada]

i think, that's it .the heating rod in y kettle is of copper. can you suggest a chelating compound and a quantity?

Iron, not copper, is apparently what kills ascorbate developers. There are some iron impurities in your chemicals which could be causing your problem.
Anyway, Dequest 2010 (similar to Etidronic acid) is reported to be a good iron-chelator. Try 1 gram/litre. Note that I haven't tried this myself.

Mark Overton

 

[Gerald C Koch]

Copper can also catalyse the Fenton reaction. This why two chelating agents are used in DS-10..

 

[RalphLambrecht]

i went back to fresh d76,and eberything is fine again. d76 rocks!

 

[RalphLambrecht]

whichare?

 

[cliveh]

i went back to fresh d76,and eberything is fine again. d76 rocks!

Of course it does.

 

[Keith Tapscott.]

i went back to fresh d76,and eberything is fine again. d76 rocks!

Stay with D-76, it is not a magic potion, but it usually gives good results with most films made by Kodak, Ilford and Fuji.

Are you still mixing your own from scratch?

 

[RalphLambrecht]

yes .i'm still mixing my own rom scratch.

 

[RalphLambrecht]

what are they?