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SCHOOL-LINE SPIRIT DUPLICATOR FLUID CAN MANUFACTURED BY DITTO DIVISION, US $92 – Picture 0
SCHOOL-LINE SPIRIT DUPLICATOR FLUID CAN MANUFACTURED BY DITTO DIVISION, US $92 – Picture 0

School-line Spirit Duplicator Fluid Can Manufactured By Ditto Division

US $92

  • Lexington, Indiana, United States
  • Oct 20th
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This is an old one gallon can. It contained fluid for old copying machines. School-Line SPIRIT DUPLICATOR FLUID MANUFACTURED BY DITTO DIVISION BELL AND HOWELL COMPANY. IT WAS SOLD AT CENTEAL SCHOOL SUPPLY, INC. LOUISVILLE, KENTUCKY. Here's the story behind the fluid used in the copy machines. 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 [5] 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 monofluoro tri-chloro methane 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 mono-fluoro tri-chloro methane. It is believed that the high efficiency of mono-fluoro tri-chloro methane 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." This process worked best with cheap, lightweight paper stocks, but when the sheets of paper were impregnated with the solvent they could easily crease or crumple, jamming the machine. One well-made master could print about 500 copies before the pigment was exhausted and the print became illegible. If fewer copies were required, the master could be removed from the printing drum and saved for future use. It's in great condition besides someone wrote OLD OIL on it in permanent marker!

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