GSD-10

Official formula changed to 2X concentrate

2010-08-05T11:01:00.000-07:00

I've changed the official formula to a 2X concentrate of the original formula. Posts dated before today all refer to the original formula, regarding dilutions. All posts from today forward will reference the new 2X concentrate. I think this is a good change!

Jim Byers-GSD-10 Semi-stand, and finding a preferred time and temperature

2010-07-05T19:42:00.000-07:00

Film: Fortepan 200

EI: 200

Format: 4x5

Developer: GSD-10

Dilution: 1:30

Temp: 25C/77F

Time: 54 min

Agitation: Continuous inversions for the first 30 seconds and then 10 seconds agitation every 9

minutes rotating the tank 1/4 turn every agitation

Presoak: 3 minute water presoak

Fixer: TF4

Camera/Lens vintage: 1952

I recently began experimenting with GSD-10 and a particular "old school" emulsion, Fortepan 200. Along the way I encountered some problems and found some solutions I would like to share.

When experimenting with a new developer/film combination there is often not a lot to go on, but there is usually information you can start with. While there is no information out there on the GSD-10/ Fortepan 200 combination there is information to leverage. Luckily there are development times and dilutions for several films on this GSD-10 blog. On the Massive Development Chart there are development times for those same films but with developers like D-76. Jay has a PF+ full stand development time for 1:10 dilution and a certain EI in one of the early blog entries. I looked and compared the D-76 time ratios of Fortepan 200 to PF+ and took into account that I wanted to shoot at box speed. I used that information to determine a good starting point for stand development with GSD-10 1:10 and Fortepan 200.

A good thing to do is try that starting point out with a negative shot in a controlled lighting situation. Since I don't have a densitometer, I metered a simple still life that included a print gradient, a grey card, and some real world objects that provide a good test of the shadow detail and highlights. The next task is to take those negatives and find the development time that best reproduces the still life and provides both the right shadow and highlight detail. I found that 32 minutes gave me the right image at 70F (21C). So I had found correct full stand development time and temperature for 1:10. But alas, I noticed that the negatives processed this way had streaks where there was a long black object in the photo. You can see this in the example below. In the image there are white streaks below the black mirror frame. So it became clear that full stand development would not work with this developer and film combination at least at this dilution. However, i was able to eliminate the streaking by going to Low Frequency Agitation development and finding the minimum agitation that gets rid of the streaking.

To eliminate the streaking I first tried an agitation half way through developmnent. I dropped the development time to 30 minutes since there was increased agitation. But there was still some streaking. The next thing to try was agitation at 1/3 and 2/3rds of the way through development. That worked. I was able to eliminate the streaking when I agitated at 9 minute intervals with a total development time of 27 minutes. The resulting negatives have nearly identical grain size, acutance, and tonality as the full stand developed negatives. I had arrived at a successful Fortepan 200/ GSD-10 combination of 1:10 dilution, 70F (21C), 10 sec agitation at 9 minute intervals, and semi-stand development. With that working well I set about seeing how things would work with a much more dilute Working solution of GSD-10. Since the Fortepan 200 I'm using is 4x5 format, the development tank needs 1300ml. So using a more dilute solution is appealing as that reduces the cost per negative noticeably. The danger of overly dilute developers is that the chemicals will exhaust before development is complete. This happens when there is not enough of the actual development chemical in the tank to complete development. I knew that Jay has examples of successful 1:10 development of 35mm on this blog. Most 35mm tanks hold about 300ml. The 1300ml 4x5 tank holds over 4X the volume of chemical. So 1:40 dilution or higher appeared possible with this tanks size and 4 4x5 sheets without exhaustion. In terms of surface area to be developed, (4) 4x5 sheets = (1) 35mm 36 exposure roll = (1) 120 roll.

Because I wanted to keep the development time under an hour, I focused on a 1:30 dilution. I tried various development times using the same 9 minute agitation intervals but found the negatives to be thinner than the 1:10 negatives unless I was willing to go significantly longer than 1 hour. Instead I raised the temperature. I found that by raising the temperature to 77F (25C) I got a great 1:30 result at 54 minutes. My Low Frequency Agitation, 1:30/ 77F/ 54 minutes produced a similar negative density to 1:10/ 70F/ 27 minutes. Temperature is definitely something you can utilize to find development times you like. Note that 54 minutes is exactly twice 27 minutes which will be a very interesting ratio to try out on other films and dilutions.

One advantage of the 1:30 dilution and perhaps the temperature increase is that the grain appears to be finer than with the 1:10 dilution. Below is a crop of a portion of the "porch picture that shows off the fine grain. Click on the photo to see it 1:1. You will see he small grain size in the 2400 dpi scan of the negative.

I am very happy with the 1:30 GSD-10 results and this is my new favorite developer for this film.

Juliet lakeside

2010-05-27T22:43:00.000-07:00

Juliet at Lake Lowell

This is my sweet Juliet on a windy day at Lake Lowell. The light was soft and beautiful, and I had my trusty Minolta XD-11 loaded with Ilford Pan F+. Life is good!

Film: Ilford Pan F+

Format: 35mm

Developer: GSD-10

Dilution: 1:7.5

Time: 20:00

Temp: 70F

Agitation: Semi-Stand

TMY-2 and GSD-10

2010-05-24T19:54:00.000-07:00

Juliet at Celebration Park

I still grin from ear to ear every time I develop a roll of TMY-2; what a feat of engineering! TMY-2 is, as the package reminds us, the sharpest 400 speed film in the world, and its grain is as fine as many 100 speed films. GSD-10 was formulated with slow, quick-to-build-contrast, fine grained films in mind. The compensating effect of GSD-10 and stand development really tames these films, opening up shadows, and protecting delicate highlight detail, but it's the midtones that matter most to me. The micro contrast produced by this film/developer combination is quite impressive. I'll be experimenting with this combination a lot, and sharing my findings here. Here's the developing information for the above photo:

Film: TMY-2

Format: 120 (6x7)

EI: 400

Developer: GSD-10

Dilution: 1:7.5

Time: 20 min

Temp: 70F

Agitation: 1 minute initial, 10 seconds at 1/2 way point

The light was very flat (SBR 5.5)

Ultrafine + ISO 100, aka Lucky film

2010-05-17T00:22:00.000-07:00

Juliet at Curtis Park

This image was made with Ultrafine + 100 film from Photo Warehouse. Many clues suggest it is re-labelled Lucky film from China, but I have no direct evidence it is. The film is wrapped in a black backing paper with no band to secure it once exposed (120 format), just a small and inadequate peel and stick square at the end of the paper backing itself. Don't trust it! I did with my first roll, and it came undone, fogging several frames. The film has a nasty curl to it that makes it difficult to load onto reels for processing, and dries into a tube after processing, complicating printing or scanning. There are no edge markings on the film, nor is there anything on the backing paper to identify the film once removed from the cheap, foil wrapper. These problems are enough to dissuade me from buying more once my current supply runs out, and that's a shame, because the film is actually very nice; it's sharp, fine grained, and true to its box speed, but so is Fuji Acros, which suffers none of the skimpiness of this budget film. I've finally learned my lesson regarding budget films, and will stock Fuji Acros as my slow film, and TMY-2 as my fast film, and I could do without the Acros, in most circumstances, and all formats except 35mm. Those more tolerant of handling quirks might find the following information useful.

Film: Ultrafine + 100

ISO: 100

Format: 120

Developer: GSD-10

Dilution: 1:5

Time: 7:30

Temp: 70F

Agitation: 10 sec/ minute, inversion

New Scan of Old Film

2010-04-13T19:28:00.000-07:00

LEAF

Julia scanned this film from 2007 with her new Epson 4490, and I like her scan better than mine using my Plustek 7200 dedicated film scanner. I'm not suggesting these differences are related to the hardware, but highlighting the influence of the operator.

Film: Pan F+
EI: 50
Dilution: 1:5
Time: 6:30
Temp: 70F
Agitation: :10/1:00 (ten seconds every minute)

Scanner: Epson 4490

Scan type: Negative

Juliet in windowlight

2010-03-09T09:25:00.000-08:00

Juliet

The above is a "Native"/unedited scan from our new Epson 4490 photo scanner. Julia made the scan at 600x800, I believe, for easy archiving, emailing, etc. We don't intend to print from our scans- we do our printing in the darkroom. The lighting for this image was very harsh/high contrast, with the sun shining directly through the window into an otherwise unlit room, reflecting off of Julia's very fair skin. I am very pleased with this rendition of the scene. My dear Father always kept his pistol next to his bed; I keep my camera there.

Film: Arista EDU 100

Format: 120 (6x7)

EI: 200

Developer: GSD-10

Dilution: 1:10

Time: 1 hour

Temp: 70F

The Darkroom Cookbook, Third Edition

2010-02-10T11:52:00.000-08:00

GSD-10 has been published in the third edition of The Darkroom Cookbook, by Steve Anchell, thanks to editor, Mark Booth. I'm honored to have my formula included in this indispensable darkroom reference book.

Amy

2007-01-12T22:55:00.000-08:00

Mi sobrina hermosa, Amy, in her new parka.

Film: TMY
EI: 400
Dilution: 1:5
Time: 6:30
Temp: 70F
Agitation: :10/1:00

PF+ @ EI 200

2007-01-08T22:13:00.000-08:00

My beautiful niece, Andrea was visiting from CA, so I wanted to take some photos, as she's growing up so fast, and I don't know how long it will be before I see her again. I was using Pan F+, but forgot to switch the exposure mode selector back to auto from manual when I loaded the film, so I underexposed the film by two stops. The results aren't bad, but I would have preferred to shoot at ISO speed, or use a diferent film, like TMX or Acros for EI 200. This was shot handheld with my Minolta XD-11/ 58mm f1.2.

Film: Pan F+
EI: 200
Dilution: 1:10
Time: 60:00
Temp: 70F
Agitation: Stand
scan: neg

GSD-10 and Pan F+

2007-01-06T01:14:00.000-08:00

I was playing around last night with Pan F+ and took this picture with my Minolta XD-11/58mm f1.2. The camera I'm holding is Chadwick's Zeiss Ikon Box Tengor. These are the desperate measures of a night owl working while everyone is fast asleep. I scanned this one as a negative instead of as a positive, like I usually do, and it worked much better for me.

Film: Pan F+
EI: 50
Dilution: 1:5
Time: 6:30
Temp: 70F
Agitation: :10/1:00 (ten seconds every minute, aka Ilford)

Chadwick after a shower

2007-01-05T03:06:00.000-08:00

This is a photo of my eldest son, Chadwick, and another of my youngest son, Leaf. This FP4+ is a lot more grainy than TMX or Acros.

Film: FP4+
EI: 160
Format: 35mm
Dilution 1:10
Time: 24:00
Temp: 70F
Agitation: Stand
Scan: Neg

TMY EI 1600

2006-12-24T23:02:00.000-08:00

This is a photo of my niece, the aptly named, Bella, by my son, Leaf. Leaf was shooting TMY @ EI 1600, in roomlight, with my Minolta XD-11 w/58mm f1.2, handheld. The film developed for about an hour, or so, while I did some other work. I think this combination shows a lot of promise for low light work.

Film: TMY
EI: 1600
Dilution: 1:10
Time: 60:00-75:00
Temp: 70F
scan: Neg

GSD-10 mixing instructions

2006-12-21T12:51:00.000-08:00

To make GSD-10 you'll need a 1 liter mixing container, the constituent chemicals, and standard lab safety equipment, including; dust mask or respirator, lab glasses and gloves. Work in a well ventilated area.

GSD-10 is made up acording to standard lab practices. Start by adding 750ml of distilled water to your mixing container. Add with stirring, the constituent chemicals in the order they appear in the formula, and be sure each chemical is completely dissolved before adding the next. When all of the chemicals have been dissolved, top up to 1 liter with distilled water. Your concentrated stock solution is now ready to use. Dilute 1:10* to make a working solution.

* Dilution ratios are written in the form X:Y. X = stock solution, and Y = total solution volume. To make a 1:10 dilution, simply divide the total volume by 10 to find the correct volume of stock solution. V/10=VSS (volume divided by ten equals volume of stock solution)

Examples

To make 1 liter- 1000/10=100ml stock solution

To make 300ml- 300/10=30ml stock solution

Enjoy!

Introduction

2006-12-19T16:50:00.000-08:00

GSD-10

GSD-10 is formulated specifically for slow, designer grain films like Kodak Tmax 100, Fuji Acros 100, and Ilford Delta 100, but produces excellent results with a wide range of films. GSD-10 exploits the unique characteristics of the developing agent, glycin to permit reduced agitation, and even stand development of state of the art, thin emulsion films, without streaking, mottling, or other development defects. GSD-10 produces negatives of excellent gradation, high acutance, extremely fine grain, and true speed increases of up to a full stop with designer grain films, whether developed for low contrast scenes, or high contrast scenes (expansion or contraction development). GSD-10 produces virtually no fog, even when developing to extremely high contrast and density ranges, which makes it as ideal for alternative/UV process printers as it is for 35mm and MF shooters. If you’ve struggled to obtain the maximum image quality potential of the new generation of films, GSD-10 will be a revelation.

Using GSD-10

GSD-10 is formulated specifically for slow, designer grain films, but produces excellent results with films ranging from slow document- type and ortho films, to IR and super-fast films. GSD-10 is a true acutance developer, and as such, very responsive to agitation as a development control. Unlike most true acutance developers, GSD-10 is compatible with rotary processing, but forfeits much of the increased speed, compensation and adjacency effects that reduced agitation encourages. Use 1:5 dilution for rotary processing with minimum solution volumes. Any agitation pattern from rotary to stand is practical, and will produce excellent results with the appropriate compensation.

Development Times for 1:10 dilution

TMX EI 200- 24:00/70F/*stand

Acros EI 200- 28:00/70F/*stand

FP4+ EI 160- 24:00/70F/*stand

TMY EI 800- 22:00/70F/ #1/3:00

* Continuous agitation for first minute, then stand for remainder

# Continuous agitation for first minute, then one inversion every 3:00

GSD-10

Official formula changed to 2X concentrate

Jim Byers-GSD-10 Semi-stand, and finding a preferred time and temperature

More concentrated stock solution?

Juliet lakeside

TMY-2 and GSD-10

Ultrafine + ISO 100, aka Lucky film

New Scan of Old Film

Juliet in windowlight

The Darkroom Cookbook, Third Edition

Amy

PF+ @ EI 200

GSD-10 and Pan F+

Chadwick after a shower

TMY EI 1600

GSD-10 mixing instructions

Introduction