Originally posted by RobG Yes, except I haven't found a reference yet where anyone mentions printing a slide onto B&W paper using the sabattier effect to get a positive image from a positive source. The halo effect is called Mackie lines apparently.
Your process sounds like solarization (the Sabattier effect) of a color slide on BW paper. You can read about that in the Darkroom Handbook by Michael Langford, starting on page 236.
It show doing it with BW on BW paper where it reversed some of the tones and darken undeveloped areas. It also mentions the Mackie line effect you'll get along the borders of originally light and dark areas. A process for doing it with color on color paper is also given.
You did a color positive on BW negative paper and the process reversed it back to a positive. The book shows putting the paper development tray (with the print in it) back under the enlarger light instead of turning on the light in the room.
The book also gives a two procedures for getting BW prints from a color slide without the solarization process. One is to make a print onto panchromatic bromide paper to make a negative and then make the positive from with a another sheet of bromide paper by contact print. The other is to use reversal paper.
Last edited by tuco; 11-05-2010 at 10:58 PM.