FORTE

PROCESSING FORMULAE

PROCESSING FORMULAE

FORTE b/w photopapers and films can be processed with good result in any customary processing chemistry.
The formulae published in the present Product Information contain the manu facturer's processing recommendations for optimal results. They give an orienta tion to photographers, who are preparing the developing solutions themselves, further they can be compared with any available processing kit, regarding its composition.
The recommended processing instructions are based on the "normal tempera ture" of 20 C (68 F) of working solutions. When processing is done at higher tem peratures (rapid machine processing or under tropical climate conditions), pro cessing time should be reduced in proportion to the temperature increase. Usually an increase of 10 C requires half of the processing time. The chemicals should be dissolved by constant stirring, in the given sequence.
The only b/w processing chemistry supplied by FORTE PHOTOCHEMICAL INDUSTRY are:

FORTESPEED developer, as a liquid concentrate, in bottles of 200, 500 and 1000 ml to be diluted in ratio of 1:10
FORTESPEED rapid fixer in bottles of 500 and 1000 ml to be diluted in ratio of 1:4

B/W PHOTOPAPER DEVELOPERS
Working solutions of b/w photopaper developers have - without replenishment
- an average capacity of processing

1,5-2, 5m2of baryta type photopapers 2,5-3,5 m2 of RC type photopapers

per 1000 ml, or per 1000 ml

 

FD 103

Universal photopaper developer for BROMOFORT, FORTEZO types

Water Methol Sodium sulphite, anhydr. Hydroquinone Sodium carbonate, anhydr.  Potassium bromide

750 ml 1,0 g 22,0 g 4,0 g 22,0 g 1,0 g

To fill up with water to 1000 ml
Developing: at 20 C for 1-2 min.

 
FD 112

Photopaper developer for warm brown image tone to be used for FORTEZO and PORTUREX RAPID types

Water Sodium sulphite, anhydr.  Hydroquinone Glycine Sodium carbonate, anhydr.  Potassium bromide

750 ml 37,0 g 10,0 g 7,0 9 57,0 g 2,0 9

To fill up with water to 1000 ml
Developing: at 20-22 C for 8 min.
Before use the developer should be diluted in ratio of 1 :4 (200 ml developer + 800 ml water).
The paper needs a three times longer exposure time when processed in this developer.
The diluted developing solution gets very quickly oxidized on air, therefore it should be used within 1-2 hours.
 

FD 6

Developer for VERDITA type paper

Water Methol Sodium sulphite, anhydr. Hydroquinone Sodium carbonate, anhydr.  Potassium bromide

750 ml 1,5 g 23,0 g 6,0 g 38,0 g 1,0 g

To fill up with water to 1000 ml
Developing: at 20 C for 45 sec.
 
 

FD 203

for b/w RC and Polygrade papers

Phenidone Sodium sulphide, anhydr. Hydroquinone Sodium carbonate, anhydr.  Potassium bromide

0,5 g 50,0 g 12,0 g 60,0 g 2,0 9

To fill up with water to 1000 ml
Machine processing: at 30-35 C for 25-40 sec.
Dish processing: to be diluted in ratio of 1 :1 0 with water, at 20 C for 90-1 20 sec.
 

FIXING BATHS
1000 ml working solution can be used for the fixing of about 25 rollfilms 120 or 135/36 exp. films, or 2 m2 of photopaper
 

FF-1

Normal fixing bath for photopapers and films

Water Sodium thiosulphate, crist. Potassium metabisulphite

750 ml 250,0 g 20,0 g

To fill up with water to 1000 ml
Fixage: at 20 C for 5-10 min.
 

FORTESPEED fixer

Rapid fixer for RC and Polygrade type papers

Ammonium thiosulphate, anhydr.  Potassium metabisulphite

780 g 80 g

To fill up with water to 1 litre.
Fixage with machine processing: at 30-35 C for 25-40 sec.
Fixage with dish processing: to be diluted in ratio of 1 :4 at 20 C for 90-120 sec.
 

FF-1 1

Hardening fixer for papers and films processed at a higher temperature

Water Sodium thiosulphate, crist.  Sodium sulphite, anhydr.  Acetic acid of 20% Alum

750 ml 200,0 g 7,5 g 24 ml 8,0 g

To fill up with water to 1000 ml
Fixage: at 20 C for 5-10 min.
 

STOP BATHS

FS-3

Normal stop bath for photopapers and films

Water Acetic acid 98%

750 ml 20 ml

To fill up with water to 1000 ml
Time of treatment for 10-20 sec.
 

FS-2

Stop bath for tropical processing

Water Sodium sulphite, anhydr.  Acetic acid 98%

750 ml 100,0 g 30 ml

To fill up with water to 1000 ml
Time of treatment: 10 to 20 seconds