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Photographic Paper Model II
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Black-and-White Panchromatic Roll Film
Black-and-White Panchromatic Film

 

 

ERA Product

Black-and-White Panchromatic Film

Characteristics & Uses

Safety Lighting

Development & Processing

Cautions

Specifications & Packing

EXECUTING STANDARD: QB/T1728-1993

Characteristics & Uses

ERA brand PSS black-and-white panchromatic film is a famous product of ERA traditional. It has won the National Science and Technology Progress Prize.
It is coated Silver halider panchromatic photo emulsion on Ester polyester base with an anti-halation backing. Its demarcated sensitivity is ISO 100/21(GB100/21).The consolidate developing sensitization can be up to 200/24, which belongs to a middle-speed black-and-white negative film.
The improved type of ERA brand black-and-white panchromatic roll film has adopted new grain panchromatic emulsion technology on the basis of ERA traditional double coats of panchromatic emulsion. As a result, it has the advantages of fine grain, high sharpness and rich gradation of pictures. Both the bright shade and dark shade appear wonderful. It is mainly used for indoor portrait photograph. It can also be used for general outdoor photograph and professional advertisement photograph. Users might get their satisfying photos after they use ERA brand black-and white photographic paper, other similar paper also can achieve the satisfaction result.

Safety Lighting

It must be operated totally in dark. If necessary, it can be watched for a few seconds under dark green safety bulb after the development is half done. The afterglow of fluorescent lamps might cause sensitization of the films even after they are turned off.

Development & Processing

ERA brand black-and-white panchromatic roll film can be developed with the general type of negative processing liquor.
 1. Developing: Developer D-23, D-76 is recommended.
                                                                      D-23 soft contrast developer       D-76 developer
    Clean water (52 ºC)                                                          750ml                         750ml
    N-methyl p-aminophenol sulfate                                         7.5g                           2.0g
    Sulphurous acid sodium without water (Na2SO3)              100g                          100g
    Hydroquinone                                                                                                        5.0g
    Borax (Na2B4O7 .10 H2O)                                                                                    2.0g
    Add water to                                                                   1000ml                       1000ml
When making the prescription, the preparation should be added according to the order as mentioned above. use the raw liquor, developing for 6-10minutes at 20 ºC.
The contrast of the film is changing with the mixing of the developer. The quicker it is mixed, the higher contrast it will be. The intensity of mixing should be controlled properly during the process of development.
Prolong the duration of developing in order to enhance the sensitometry of the film if necessary.
 2. Stop bath: This is a process of stop development. After developing, immerge film in 2% Glacial acetic acid for 20 seconds.
 3. Fixing: F-5 fixing solution is recommended. 
    Sodium thiosulphate acid (Na2S2O3 .5H2O)                      240.0g
    Sulphurous acid sodium without water (Na2SO3)              15.0g
    28%Glacial acetic acid (CH3COOH)                                   48ml
    Boric acid (H3BO3)                                                             7.5g
    Potassium alum (KAI (SO4) 2.12 H2O)                               15.0g
    Add water to                                                                   1000ml
The effect of the fixing is that removes emulsion having no reaction, therefore it should be sure of removing the emulsion completely. When using fresh acid fixing solution for 5--10minutes.
 4. Washing: Wash film in running water at least for above 15 minutes.
 5. Drying: For avoiding surplus water affecting the manufacture of photo, using a sponge for a special purpose or one big absorbent cotton put film slightly on both side to remove surplus water, hang it up to dry or in heat-drier at 30--40 ºC or air-dried at room temperature in a dust-free place.

Cautions

Film should be kept in cool and dry environment. Harmful gases and objects and radioactive objects should be kept away.
Special attention stockpile conditions of the film during hot and humid season. The unpacked film or film that have not been fully photographed must be kept in a cool and dry environment.
Film kept in low temperature should be taken out earlier before use. Place them in room temperature for 1-2 hours after unsealing to avoid water vapor from condensing and damaging the surface coating.
Film is valid for two years. The photographic performance of  film might be changing with the duration of stock, so they should be used up within the term of validity. The film that has been assembled in the camera should be taken up quickly and the exposed film has to be developed as quickly as possible.

Specifications & Packing

Species Specification Unit Packing Count/Per Carton
PSS Film 10.2CM X 12.7CM X 25(4 X 5吋) Box 40
8.25CM X 12CM X 24 Packet 80
12CM X 16.5CM X 24  Packet 80
     
     

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