I would also highly recommend Tim's book "The Master Photographers Toning Book", as it gives a wealth of information, and dispels many myths about toning.
On lith prints selenium can indeed give oranges, reds, and maroons; depending of course upon which papers and developers are being used. As Tim says, always keep notes, so when you get an effect you like, you can go back and reproduce it
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As for the "archival treatment" dilution; if you are referring to dilutions of 1+20, or more dilute, this is one of the myths he dispels. At those dilutions, the selenium is far too weak to provide protection to the highlights, or midtones of a print.