U of S | Mailing List Archive | alt-photo-process-l | Re: LC-1 developer question

Re: LC-1 developer question

I just looked at the formula for LC-1B. It contains as much sodium sulphite as I had used in my concentrated version of LC-1. However it also contains the bisulphite. I'm curious if there have  been similar problems of crystalization with LC-1B or if perhaps the bisulphite helps keep the metol / hydroquinone in solution better? I understand that it would extend its storage life.

metol 4 gr
sodium sulfite 120 gr
hydroquinone 4 gr
sodium bisulfite 30 gr
water to make 1 liter 


On 27-Mar-08, at 5:58 PM, Ryuji Suzuki wrote:
Without doing a wet lab work I can't really tell you how much
but I'd cut the portion of Part B. The more B is added, the
more acidic the developer will become.

I've not done research on Fujifilm HG HSA film so I don't know
the exact nature of this emulsion. First thing you need to
know is whether the emulsion is chloride based or bromide
based. Optimal developing conditions vary between them,
especially in terms of sulfite concentration. Usually you can
tell that by looking at the processing chemicals for the
particular exposure/film/processing system. Chloride emulsions
allow much faster processing time and higher processing
capacity per chemical change.

Laser scanner emulsions are particularly designed for high
contrast, even if the same film is also used for continuous
tone images, to reduce the effects of light scattering and
smearing. There are a number of different generations of
technologies that went into this line of emulsions, and it's
hard to predict which type a particular product is without
doing a specific research.

Ryuji Suzuki
"Make something religious and people don't have to deal with it, they
can say it's irrelevant." (Bob Dylan, Biograph booklet, 1985)

From: david drake <daviddrakephoto@sympatico.ca>
Subject: Re: LC-1 developer question
Date: Thu, 27 Mar 2008 17:22:49 -0400

Ryuji, what would you suggest adding to raise pH slightly? I have been processing at 75 degrees, but will try higher.
The 'lith' film I have been using recently is a Fuji scanner film HG HSA. I also use APHS but haven't tried with LC-1.

LC-1 developer formula:
part A (1litre solution)
3 grams metol
3 grams hydroquinone
60 grams sodium sulfate
part B (1 litre solution)
10 grams sodium bisulfate

Thanks very much for your help.


On 27-Mar-08, at 3:06 PM, Ryuji Suzuki wrote:

From: david drake <daviddrakephoto@sympatico.ca>
Subject: Re: LC-1 developer question
Date: Thu, 27 Mar 2008 13:41:17 -0400

  So, do I need to be using double the amount of sodium
  sulphite or would the normal amount of 60 grams work?

First of all, reducing sulfite may increase the solubility of
Metol, but it may not be enough to solve your problem.

All these will have to be determined experimentally. The
amount of sodium sulfite has influence on the development, and
it depends heavily on the type of the emulsion being used.
The term "lith film" doesn't really describe much, since the
term "lith" is commonly abused to mean high contrast emulsions
for printing films in general, and there are a very wide range
of such emulsions. Generally speaking, modern printing
emulsions are monodisperse cubic AgBr emulsions of 0.05 to 0.2
microns edge length, sulfur sensitized. Most modern ones
probably make mostly surface image, and don't really require
much sulfite to develop properly. But depending on the nature
of latent image centers (determined largely by chemical
sensitization and crystalline defects introduced to the
crystals), varying the amount of sulfite may affect the
sensitometric curves of the overall system.

More immediate effects, however, is that the pH of the
developer will likely change if you change the sulfite content
without adjusting the pH, and this will have a direct impact
on the developer activity and sensitometric curves with
whatever emulsion you use.

In a low pH Metol developer, doubling the Metol concentration
does not double the rate of development. If your main
complaint is long development time, I suggest you try raising
the processing temperature, raising pH slightly, or
combination thereof.

Ryuji Suzuki
"Make something religious and people don't have to deal with it, they
can say it's irrelevant." (Bob Dylan, Biograph booklet, 1985)

david drake photography

david drake photography