Can anyone suggest a suitable book for me on B&W dark-room techniques? I consider myself a borderline "intermediate"/"red-run" printer. I do not want to read another book about types of enlarger. Although reasonably mathematically minded, I would rather not wade through a detailed account of "Dmax". As a surgeon, information that does not alter my practice is fairly irrelevant. Tips and hints are, however, invaluable. The same applies to photography. I am familiar but inexpert with the basic toning techniques. I use split-contrast printing but without finesse. How does one adjust the basic "correct" exposure at contrast-2, to take account of using contrast 3.5 and 0.5? Why 3.5 and 0.5, why not 4 and 1, etc.... Is there a mathematical relationship or is it trial and error? How best to plan test-strips? And so on. Many may have passed through this stratum/level and I would be very grateful for suggestions about suitable reading. Or, is it just practice?