Re: Paper negatives (Re: Tricolor gum, order of layers)
Keith, The following is the info I got from my supplier: Technical White Oil Description This mineral oil is based on especially selected saturated paraffinic and cyclo-paraffinic hydrocarbons. Due to an intensive method of refining this white oil is acid-free and nearly colourless and odourless. Application This white oil has a wide range of applications: - as a lubricant for precision machining, sewing machines, other textile machining etc. - as base material in the plastic, rubber, chemical and other industryprocesses - as baseoil for insecticides This oil can not be used in the medical or food industry where food can contaminate with the lubricant. Performance Level WOMA - 1006 Typicals : Colour, Saybolt 28,0 Density at 15 °C, kg/l 0,855 Viscosity 20 °C, mm²/s 31,00 Viscosity 40 °C, mm²/s 14,50 Viscosity 50 °C, °E 1,90 Viscosity 100 °C, mm²/s 3,60 Viscosity Index 135 Flash Point COC, °C 185 Pour Point, °C -13 It seems to be a fairly common basic oil, priced around 5 euro/litre. I completely agree with Katharine's post: I no longer bother with the mylar separation sheets and have used oiled negs after approx. 2 years with the same exposure times, the paper feels only slightly greasy. Best, Guido 2008/10/5 Keith Gerling <keith.gerling@gmail.com> > > Hi Guido, > > Could you provide a source for that "white technical oil"?
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