D-76H replenishment?

Hallo.
I want to prepare this kind of developer.

750 ml, Distilled Water
2.5g, Metol
100g, Sodium Sulfite (Anhydrous)
2g, Borax
water to make 1.0 L

does anybody knows the replenishment for it?

is there a big difference between D-76H and KODAK D-23 in negative image?

Thank You
:confused:

Welcome to APUG

D76H isn't a Kodak formula. The closest Kodak published were D103 and DK76b neither had replenishers.

D23 may well be better, finer grained but with a touch less film speed. It was an official Kodak formula.

Ian

Don't bother replenishing D-76H. It's dirt cheap; use once and discard, for best results. There are some here who have had good results with replenishment; my take is that it makes sense only for large-volume processing operations.

My limited experience with D-23 suggest to me that there's not a lot of difference from D-76.

D-76H: A 1/3 Strength D-23

vano said:

Is there a big difference between D-76H and KODAK
D-23 in negative image?

Click to expand...

D-76H has three times as much sulfite as D-23 for same
developer capacity. That is, a same capacity D-23 would
have 1/3 the amount of sulfite.

Having no hydroquinone, the borax I believe
serves no purpose. Dan

The Borax along with the sulphite controls the pH more effectively it should be around 9.5. This in more important when a developer is re-plenished which is why the D23/D25 replenisher D25R uses Sodium Metaborate (Kodalk).

Ian

vano said:

Hallo.
I want to prepare this kind of developer.

750 ml, Distilled Water
2.5g, Metol
100g, Sodium Sulfite (Anhydrous)
2g, Borax
water to make 1.0 L

does anybody knows the replenishment for it?

is there a big difference between D-76H and KODAK D-23 in negative image?

Thank You
:confused:

Click to expand...

As already said, the so called D-76H formula is cheap to make and is probably not worth replenishing, although there is a version made by the photographers-formulary called TD-16 with TD-16R replenisher.

D-76H was suggested by Grant Haist as an alternative to the standard D-76 formula.
Metol is slightly acid while hydroquinone is slightly alkaline, so I think that DK-76b which is almost identical to D-76H, but uses Kodalk instead of borax is probably closer to standard D-76.
I would consider making DK-76b as a two-part stock solution for better keeping if stored for a long time.

Try this.

SOLUTION `A`
Water around 35-40*C = 400ml
METOL = 2.5 grams
SODIUM SULPHITE, ANHYDROUS = 50 grams
Add more water to make 500ml of stock-solution.

STOCK-SOLUTION `B`
Water around 35-40*C = 400ml
SODIUM SULPHITE, ANHYDROUS = 50 grams
KODALK Balanced Alkali = 2 grams
Add more water to make 500ml.

Use 1 part `A`+ 1 part `B`+ 2 parts water and use it as a one-shot developer. Treat it as D-76/ID-11 diluted 1+1.
If you want a replenishable developer, try D-23 with DK-25R.

Ian Grant said:

Welcome to APUG

D76H isn't a Kodak formula. The closest Kodak published were D103 and DK76b neither had replenishers.

D23 may well be better, finer grained but with a touch less film speed. It was an official Kodak formula.

Ian

Click to expand...

That means that Grant Haist simply replaced Kodalk with borax in DK-76b. I would make DK-76b for reasons in my previous post. Hydroquinone is alkaline and is probably why Kodak used Kodalk due to it being left out.

Thank you all!
Today i will make some developer and i think it is DK-76b as a two-part stock solution, posted by Keith Tapscott.
Keith, do you know what is the basic time for develop?

DK76b is a just touch more alkaline than D76H but the standard D76 times should be fine as a starting point.

Ian

vano said:

Thank you all!
Today i will make some developer and i think it is DK-76b as a two-part stock solution, posted by Keith Tapscott.
Keith, do you know what is the basic time for develop?

Click to expand...

For 1 part `A` + 1 part `B` only, start with the times for undiluted D-76 and for 1 part `A` + 1 part `B` + 2 parts of water, start with the times for D-76 diluted 1:1 which is what I would use. e.g; 150ml `A` + 150ml `B` + 300ml of water or what ever volume you require.

Ian Grant said:

The Borax along with the sulphite controls the
pH more effectively ...

Click to expand...

Ph control is a characteristic needed by and
associated with D-76 because of it's hydroquinone
content. I don't recall of any metol only developer
needing ph control. In any case I'd think one-shot
use would obviate the need for such control.

I just wonder at what it was that motivated Haist
to suggest such a developer; so loaded with sulfite
yet so little capacity. Does that over abundance of
sulfite confer some special quality to the film
being processed? Dan

pH control is used with D23 by adding Metabisulphite the pH is lowered it then becomes D25, grain becomes very much finer and the effective EI cut roughly in half.

As D76H is supposed to have come from a suggestion of Haist's in a conversation and he'd obviously have been far more aware than any of us of the variations of D76 the evolution of D23/25 DK20, D103 etc.

The facts are that Kodak played with an enormous number of variations of D76 and only published a few, Haist wouldn't remember them all.

Kodak adapted the Wellington & Ward Buffred Borax MQ developer increasing the sulphite very significantly to arrive at D76. The level's high so it acts as a silver solvent, the Metol increased slightly over D76 to compensate for the lack of Hydroquinone. It's a logical off the cuff suggestion in a discussion on developers.

Ian

dancqu said:

Ph control is a characteristic needed by and
associated with D-76 because of it's hydroquinone
content. I don't recall of any metol only developer
needing ph control. In any case I'd think one-shot
use would obviate the need for such control.

I just wonder at what it was that motivated Haist
to suggest such a developer; so loaded with sulfite
yet so little capacity. Does that over abundance of
sulfite confer some special quality to the film
being processed? Dan

Click to expand...

If D-23 is used undiluted and replenished with DK-25R, it too becomes a borate-buffered developer. It also has the same amount of sulphite as D-76 and D-76H in the stock solution.
Using a simple Metol + sulphite developer with or without another accelerator that can be mixed to working strength for immediate one-shot use also has it`s merits, but unfortunately, there isn`t much technical data available for starting point developing times depending on formulae.
I think that the suggestion of using DK-76b will at least give the OP something to start with, but whether equal or better results can be obtained with just metol + sulphite IDK. Any suggestions?

Ian Grant said:

The facts are that Kodak played with an enormous number
of variations of D76 and only published a few, Haist wouldn't
remember them all.Ian

Click to expand...

If he did forget D-76H he's not alone. I wouldn't even consider
a developer so over loaded with unnecessary chemistry.

D-23 with three times the capacity would need 300 grams of
sulfite to equal the D-76H metol to sulfite ratio. Dan

Remember that the work on these developers "D76 type" began in the late 20's and continued into the 40's, and aside from Ilford's PQ versions in the late 40'sand 50's reached a halt.

Other companies like Agfa, Gevaert etc used similarly high quantities of sulpite to developing agent so it's not unusual. Typically if you drop the amount of sulphite you increase developer activity which is what Ilford did with Microphen/ID-68, their commercial PQ variant of ID-11(D76) has 100g/l Sulphite this was dropped to 80g/litre.

The very high sulphite level is one approach used to achieve finer grain and better tonality.

Ian