Unless all you want is a simple line, you should use a continuous tone film rather than a lith material. My favourite was Kentmere Line film, but other Line films are probably suitable. Available from specialist photo suppliers, they are not cheap. Their work is dealt with more fully in a later article . The first artist known to have used solarization in his work was however Degas , roughly 50 years earlier, and Jolly shows an illustration of this and quotes an article by Janet Buerger in which she argues the effect had a strong influence on his drawings, particularly the unusual luminosity in his work.
Solarizations are often contact printed onto another sheet of paper or film.
If you are using a multigrade paper you can use filters to increase or reduce contrast as normal. Exposure times will be rather longer than normal because of the paper, but there will be little or no loss in sharpness so long as the two sheets are in firm contact. More complex derivations can be produced by solarising these contacts and repeating the process. Full directions for solarisation and other related processes are detailed in Jolly's text. Here, briefly, is how I did it.