Re: Paper negatives (Re: Tricolor gum, order of layers)
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
- 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.
2008/10/5 Keith Gerling <email@example.com>
> Hi Guido,
> Could you provide a source for that "white technical oil"?