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Black-and-White Panchromatic Roll Film
Black-and-White Panchromatic Film

 

ERA Product

Black-and-White Panchromatic Roll Film

Characteristics & Uses

Safety Lighting

Development & Processing

Cautions

Specifications & Packing

EXECUTING STANDARD: QB/T1729-1993

Characteristics & Uses

ERA brand PSS black-and-white panchromatic roll film is a famous product of ERA traditional. It has won the National Silver Prize and the second place of the National Science and Technology Progress Prize.
It is coated Silver halider panchromatic photo emulsion on Acetate fiber (gray) base. The marked sensitization is ISO 100/21(GB100/21).The consolidate developing sensitization can be up to 200/24, which belongs to a medium speed grain type, it is supplied in DX coded cassettes, suitable for all 35mm cameras. It can be widely used in both professional and amateur picture taking either inside or outside the house, such as images, advertisements, art, views and touring pictures taking.
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. 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 roll 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 roll film if necessary.
 2. Stop bath: This is a process of stop development. After developing, immerge roll 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 roll 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 roll 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

Roll film should be kept in cool and dry environment. Harmful gases and objects and radioactive objects should be kept away.
Roll 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.
When the roll film is developed during the hot season, the photographic developer should be kept under control. The temperature should be around 20C, so that avoid the roll film would get gray in developing, the grain would get coarse and the surface coating would be damaged because of the high temperature of the developers.
Direct sunshine should be avoided when assembling and disassembling the roll film.
Roll film is valid for two years. The photographic performance of roll film might be changing with the duration of stock, so they should be used up within the term of validity. The roll film that has been assembled in the camera should be taken up quickly and the exposed roll film has to be developed as quickly as possible.

Specifications & Packing

Species Specification Unit Packing Count/Per Carton
Roll Film 3.5CM X 305Mts Bulk Roll 5
135-36 Roll 400
135-24 Roll 400

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