I had comparative test for two holographic developers for photoplates PFG-03m: GP-3 and MM Color 1.
The parameters of test was next:
- exposition of photoplate: 0,5 mJ/cm.sq.
- tempetature of develop: 19C
GP-3:
- dilute: 1:30
- time of develop: 5 min
MM Color 1:
- dilute: 1:50
- time of develop: 30 min
and
- dilute: 1:100
- time of develop: 40 min
Result: the bright of hologram for GP-3 is better then for MM Color 1. The color of image is yellow for GP-3 and is red for MM Color1.
The density om emulsion layer is biggish for MM Color 1 then for GP-3. So, the develop process more fine for GP-3. The increase of dilute for MM Color 1 don't influence to quality of hologram.
Maybe, somebody have other result.
GP-3 or MM Color 1?
-
Sergey Vorobyov
GP-3 or MM Color 1?
I had experiments for improve developer MM Collo 1 for develop photoplates PFG-03m. It has conflicting formula (as I think), for example it consist KBr and ammonium thiocyanate. This component has opposite actions - ammonium thiocyanate dissolves AgBr (and this very important for physical develop) and KBr impede of this dissolve.
I remove KBr from formula and add ammonium thiocyanate before 15g/l for more effectuality. I add sodium sulfite 20g/l too, for reduce of oxidation of developer.
I received next formula (let it have name “SD” developer):Metol...2g
Sodium sulfite...20g
Ascorbic acid...7g
Methylphenidone...0,5g
Potassium carbonate...20g
Ammonium thiocyanate...15g
Water...1l
Dilution 1:50 (10 ml to 500 ml water)Condition of record: E – 0,4 mJ/sq.cm, time of develop – 30 min, temperature – 20C
Comparative develop in GP-3 had parameters: dilution 1:30 (15 ml to 400 ml water), time of develop – 7 min, temperature – 20CThe analysis of test holograms show: the brightness and contrast of image of both holograms is equal! So, such developer can be use as level as GP-3.
I shell try show photos of this holograms on our site, if can.The image has been added here: [ 08 August 2003: Message edited by: Administrator ]
I remove KBr from formula and add ammonium thiocyanate before 15g/l for more effectuality. I add sodium sulfite 20g/l too, for reduce of oxidation of developer.
I received next formula (let it have name “SD” developer):Metol...2g
Sodium sulfite...20g
Ascorbic acid...7g
Methylphenidone...0,5g
Potassium carbonate...20g
Ammonium thiocyanate...15g
Water...1l
Dilution 1:50 (10 ml to 500 ml water)Condition of record: E – 0,4 mJ/sq.cm, time of develop – 30 min, temperature – 20C
Comparative develop in GP-3 had parameters: dilution 1:30 (15 ml to 400 ml water), time of develop – 7 min, temperature – 20CThe analysis of test holograms show: the brightness and contrast of image of both holograms is equal! So, such developer can be use as level as GP-3.
I shell try show photos of this holograms on our site, if can.The image has been added here: [ 08 August 2003: Message edited by: Administrator ]
-
Martin
GP-3 or MM Color 1?
"The analysis of test holograms show: the brightness and contrast of image of both holograms is equal! So, such developer can be use as level as GP-3."
This is good news, thank you for your tests!I have to admit your results do no surprise me much. When we run our tests of PFG-03 with different developer formulas, we soon found out that very little had to be done to get very satisfactory results. For example by adding a few grams of ammonium thiocyanate to a simple commercial paper developer ("Neutol", Agfa), we immediately achieved results that rivaled with GP-2 and GP-3 development.Regarding the composition of MM-Collo1, some observations:
"I had experiments for improve developer MM Collo 1 for develop photoplates PFG-03m. It has conflicting formula (as I think), for example it consist KBr and ammonium thiocyanate. This component has opposite actions - ammonium thiocyanate dissolves AgBr (and this very important for physical develop) and KBr impede of this dissolve."I am not sure about that statement. It took me a while to understand that KBr could carry out the same function as the ammonium thiocyanate. At least at high concentration, KBr can be used to fix photographic emulsions - provided the latter is formed of silver chloride/silver bromide (and not of silver iodides!).
By the way, if I am not misled there is a Russian colloidal developer, PRG-1, that is based but on KBr as the silver halide solvent.So to come back to the initial formula of MM-Collo1, the addition of a relatively low amount of KBr was designed to act as a fog inhibitor. And so far it really provided extremely clean layers at that time.
This is good news, thank you for your tests!I have to admit your results do no surprise me much. When we run our tests of PFG-03 with different developer formulas, we soon found out that very little had to be done to get very satisfactory results. For example by adding a few grams of ammonium thiocyanate to a simple commercial paper developer ("Neutol", Agfa), we immediately achieved results that rivaled with GP-2 and GP-3 development.Regarding the composition of MM-Collo1, some observations:
"I had experiments for improve developer MM Collo 1 for develop photoplates PFG-03m. It has conflicting formula (as I think), for example it consist KBr and ammonium thiocyanate. This component has opposite actions - ammonium thiocyanate dissolves AgBr (and this very important for physical develop) and KBr impede of this dissolve."I am not sure about that statement. It took me a while to understand that KBr could carry out the same function as the ammonium thiocyanate. At least at high concentration, KBr can be used to fix photographic emulsions - provided the latter is formed of silver chloride/silver bromide (and not of silver iodides!).
By the way, if I am not misled there is a Russian colloidal developer, PRG-1, that is based but on KBr as the silver halide solvent.So to come back to the initial formula of MM-Collo1, the addition of a relatively low amount of KBr was designed to act as a fog inhibitor. And so far it really provided extremely clean layers at that time.
-
Sergey Vorobyov
GP-3 or MM Color 1?
Can you record test holograms, which confirm your presumption about good influence of KBr? All we have different chemical, so we must make comparative test record. I record ONE hologram, cut it to two parts and make different develop for each of this parts. It give guarantee, both parts had equal exposition.
-
Martin
GP-3 or MM Color 1?
quote:Originally posted by Sergey Vorobyov:
I had comparative test for two holographic developers for photoplates PFG-03m: GP-3 and MM Color 1.
The parameters of test was next:
- exposition of photoplate: 0,5 mJ/cm.sq.
- tempetature of develop: 19C
GP-3:
- dilute: 1:30
- time of develop: 5 min
MM Color 1:
- dilute: 1:50
- time of develop: 30 min
and
- dilute: 1:100
- time of develop: 40 min
Result: the bright of hologram for GP-3 is better then for MM Color 1. The color of image is yellow for GP-3 and is red for MM Color1.
The density om emulsion layer is biggish for MM Color 1 then for GP-3. So, the develop process more fine for GP-3. The increase of dilute for MM Color 1 don't influence to quality of hologram.
Maybe, somebody have other result.Yes, this would make an interesting test. The problem is I only have a few
tiny pieces of old PFG-03 film left, heavily stained brown around the edges.
In addition, having made some experience with the problems of increased hardening (ageing)
over a certain period of time, it might be best to run such a test with film samples from the same batch.
I had comparative test for two holographic developers for photoplates PFG-03m: GP-3 and MM Color 1.
The parameters of test was next:
- exposition of photoplate: 0,5 mJ/cm.sq.
- tempetature of develop: 19C
GP-3:
- dilute: 1:30
- time of develop: 5 min
MM Color 1:
- dilute: 1:50
- time of develop: 30 min
and
- dilute: 1:100
- time of develop: 40 min
Result: the bright of hologram for GP-3 is better then for MM Color 1. The color of image is yellow for GP-3 and is red for MM Color1.
The density om emulsion layer is biggish for MM Color 1 then for GP-3. So, the develop process more fine for GP-3. The increase of dilute for MM Color 1 don't influence to quality of hologram.
Maybe, somebody have other result.Yes, this would make an interesting test. The problem is I only have a few
tiny pieces of old PFG-03 film left, heavily stained brown around the edges.
In addition, having made some experience with the problems of increased hardening (ageing)
over a certain period of time, it might be best to run such a test with film samples from the same batch.