Rdxfbgrtj

Part of a series on the
History of printing
Woodblock printing 200 Movable type 1040 Printing press c. 1440 Etching c. 1515 Mezzotint 1642 Aquatint 1772 Lithography 1796 Chromolithography 1837 Rotary press 1843 Hectograph 1869 Offset printing 1875 Hot metal typesetting 1884 Mimeograph 1886 Photostat and rectigraph 1907 Screen printing 1911 Spirit duplicator 1923 Dot matrix printing 1925 Xerography 1938 Phototypesetting 1949 Inkjet printing 1967 Dye-sublimation 1957 Laser printing 1969 Thermal printing c. 1972 Solid ink printing 1986
v t e

A spirit duplicator (also referred to as a Ditto machine in North America, Banda machine in the UK or Roneo in Australia, France and South Africa) is a printing method invented in 1923 by Wilhelm Ritzerfeld and was commonly used for much of the rest of the 20th century. The term "spirit duplicator" refers to the alcohols that were a major component of the solvents used as "inks" in these machines.^[1][2][3] The device coexisted alongside the mimeograph.

Spirit duplicators were used mainly by schools, churches, clubs, and other small organizations, such as in the production of fanzines, because of the limited number of copies one could make from an original, along with the low cost (and corresponding low quality) of copying.

History

The spirit duplicator was invented in 1923 by Wilhelm Ritzerfeld. The best-known manufacturer in the United States and the world was Ditto Corporation of Illinois. Copiers in the United Kingdom were commonly manufactured by Associated Automation Ltd of Willesden, London NW10, a subsidiary company of the computer makers Elliott-Automation Ltd for the Block & Anderson company, under their "Banda" brand. In both cases the trademark became a generic name for both the copiers and the process in their respective markets.

The faintly sweet aroma of pages fresh off the duplicator was a memorable feature of school life in the spirit-duplicator era.^[4]

Design

A school newspaper published using a ditto machine in 1978

A hand-cranked spirit duplicator from the 1960s

The duplicator uses two-ply "spirit masters", also called "master sheets". The first sheet can be typed, drawn, or written upon. The second sheet is coated with a layer of wax that had been impregnated with one of a variety of colorants. The pressure of writing or typing on the first sheet transfers the colored wax from the second sheet to the shiny/coated back side of the first sheet, producing a mirror image. This produces the same result of a sheet of carbon paper put in backwards. The two sheets are then separated, and the first sheet is fastened onto the drum of the machine, with the back side facing out, acting as a printing plate.

There is no separate ink used in spirit duplication, as the wax transferred to the back side of the first sheet contains the ink. As the paper to be printed moves through the printer, the solvent is spread across each sheet by an absorbent wick. When the solvent-impregnated paper comes into contact with the back side of the first sheet, it dissolves just enough of the pigmented wax to print the image onto the paper as it goes under the printing drum. One master can produce 40 or so good copies; after that, the copies gradually become paler as the colored wax is used up.^[5]

Colors

The usual wax color was aniline purple (mauve), a cheap, moderately durable pigment that provided good contrast, but masters were also manufactured in red, green, blue, black, and the hard-to-find orange, yellow, and brown. All except black reproduced in pastel shades: pink, mint, sky blue, and so on.

Spirit duplicators had the useful ability to print multiple colors in a single pass, which made them popular with cartoonists. Multi-colored designs could be made by swapping out the waxed second sheets; for instance, shading in only the red portion of an illustration while the top sheet was positioned over a red-waxed second sheet. This was possible, because the duplicating fluid was not ink, but a clear solvent.

The duplicating fluid typically consisted of a 50/50 mix of isopropanol and methanol, both of which were inexpensive, readily available in quantity, evaporated quickly, and would not wrinkle the paper.

In 1938, ^[6] a nonflammable solvent was invented by Johan Bjorksten to allow the possibility of using electrically driven machines without the concern of the flammability of pure methyl/ethyl alcohol. "A composition composed of 10% of trichlorofluoromethane and 90% of a mixture of 50% methyl alcohol, 40% ethyl alcohol, 5% water and 5% of ethylene glycol mono-ethyl ether. This solvent mixture is non-flammable in the closed space of the reservoir and has a flash point of 100 °F when fully exposed to air. The solvent mixture has a pleasant odor, reduced toxicity and gives at least as good copies as the duplication liquid before the addition of the trichlorofluoromethane. It is believed that the high efficiency of trichlorofluoromethane as a flame reducing agent is due to the fact that its boiling point is sufficiently low as to cause the formation of a non-flammable vapor film on the surface of the organic solvent, with sufficiently high boiling point as to be substantially retained by the solvents even at high summer temperatures."

Durability

Dittoed copies now pose a serious challenge to archivists responsible for historic document and artistic preservation. Dittoed images gradually fade with exposure to ultraviolet light, limiting their usability for permanent labels and signage. When exposed to direct sunlight ditto copies can fade to illegibility in less than a month. The low-quality paper often used would yellow and degrade due to residual acid in the untreated pulp. In the worst case, old copies can crumble into small particles when handled.

See also

• Duplicating machines


• Hectograph


• Fordigraph


• List of duplicating processes

References

Further reading

• 
  Information Processing Equipment. Edited by M.P. Doss ... Contributors: Hubbard W. Ballou [and Others], Etc. New York. 1955.
  


• 
  Irvin Albert Herrmann (1956). Manual of Office Reproduction: Reproduction Processes, Systems Duplicating. Office Publishing Company.