Re: Paper negatives (Re: Tricolor gum, order of layers)
Just rub the reverse side of the negative with a suitable oil. After trying different oils I settled on "white technical oil", it is as liquid as water and has the same (no)
color. I believe it is the same (paraffin) oil sold in smaller cans for sewing-machines, in greater quantities (1 litre) it is very cheap. I usually rub it generously in and let it sit overnight when all the oil seems to be completely absorbed by the paper and for gum I don't even use the thin milar separator sheet (between neg and coating to avoid oil stains) anymore. After a few days the oil may evaporate more and the paper becomes less transparent, just oil again if you want to reuse the negative.
Another method is to use blocks of paraffin on the, heated, reverse side of the negative. Use an iron to heat the paper in parts and apply the paraffin, ending with rubbing the molten paraffin with a paper towel to spread/clean up excess paraffin. Takes a bit of practice but once cooled down the paper remains translucent and is not oily.
2008/10/5 Laura Valentino <firstname.lastname@example.org>
Since I just recently paid about $150 to have 40 sheets of 11x17 OHP film shipped to me, I gotta try the paper negative. I have a box of this formerly named photo quality inkjet paper. How do I oil it?