Duplicating Film
A duplicating film is used to make copies of the original silver based camera film. These duplicate films are required for off-site storage, security, distribution etc. Duplicate film is available in the same formats as the original silver halide camera film ie. 16mm, 35mm, 105mm in roll or A6 sheets and aperture cards.
Types of duplicating film
Diazo Film
This is a very low cost copying medium with up to 50 years archival life. For normal commercial purposes this is the ideal economical, very hard wearing, copying medium. Diazo film is processed using ammonia gas or liquid to produce either a blue or black image from the original film.
Vesicular Film
A duplicate made with vesicular film automatically reverses the image, ie. a negative original produces a positive vesicular copy. (Vesicular film is not recommended for copying positive originals) Vesicular film produces a white image on a powder blue background from the original film. Processing of this film is completed by heat alone-no ammonia is needed. It is a low cost copying medium with 10-20 years archival life.
Color Striping – Diazo and Vesicular Only
One of the most popular formats of diazo and vesicular duplicating film is 105mm rolls or 105mm x 148mm sheets, commonly referred to as microfiche. Microfilm Products Company has the facility to convert diazo or vesicular into rolls or sheets with colour stripe, if required. The colour stripe is used to make indexing simpler by allocating subject groups a particular colour. These stripes are available in a variety of widths and colours depending on how much eye readable information is printed on the heading stripe at the top of the microfiche.
Stripe Widths Available
| Details | |
|---|---|
| Stripe Widths Available: | 1/4", 5/16", 3/8", 1/2" |
| Available Colors: | Light blue, Black, White, Grey, Orange, Yellow |
| Product # | Rolls/Carton | LBS/Carton | Dimensions |
|---|---|---|---|
| 16 x 1000 x 4 | 20 rolls per carton | 30 | 16.3 x 8.1 x 9.6 |
| 16 x 2000 x 2.5 | 14 rolls per carton | 28 | 9.5 x 9.6 x 8.1 |
| 35 x 1000 x 4 | 10 rolls per carton | 33 | 17.2 x 8.8 x 7.2 |
| 35 x 2000 x 4 | 6 rolls per carton | 38 | 11.2 x 11.2 x 8.8 |
| 105 x 1000 | 2 rolls per carton | 25 | 10.8 x 10.8 x 8.3 |
| 105 x 1500 | 2 rolls per carton | 36 | 12.6 x 12.5 x 8.3 |
| Cut Fiche | 2000 sheets per carton | 12 | 12.6 x 9.3 x 2.6 |
| Film | Description |
|---|---|
| Black Diazo | 2722 |
| Blue Diazo | 2753 |
| Vesicular | 3252 |
| Cycled Vesicular | 3254 |
105mm Rolls
These can be supplied colour striped in either ‘A’ or ‘B’ wind format depending on the set-up of your duplicating machine. Please see diagram below.
A or B wind must be specified when you order.
105 X 148mm Sheets(Microfiche) Standard Formats
Cut Corners
One corner of each diazo sheet is normally cut off. If the cut corner is positioned to the top right then the emulsion is on the reverse side of the material.