I noticed the answer to your question may be found in the answer in a thread on this same forum:(posted 8375 days ago)"Just a basic question about selenium toning to compensate for difficult to print negs.. There have been a number of references to this in several recent threads. Could anyone provide a summary of the circumstances when you'd use this? With negs that have been over-developed (or over-exposed) or under-developed (or under-exposed)? Are there any side-effects or downsides to doing it? What would be the best techniques? Many thanks! -- Ed Hurst (BullMoo@hotmail.com), June 25, 2001 Answers For correctly exposed and underdeveloped images. If your nehative shows adequate shadow detail but the highlights arenot dense enough, that's a good candidate for selenium intensification - it should yield about the same effect as an increase in paper contrast of about a grade. Selenium intensification also provides protection to the image from the harmful effects of oxidizing gases in the air. Disadvantages - I guess its kind of permanant, so if you like playing bleach-redevelopment games.... but bleach-redeveloping negatives is kind of chancy itself.... Cheers, DJ -- N Dhananjay (ndhanu@umich.edu), June 25, 2001."
Good luck... t