The 30th Anniversary (5th) edition of DCB is in the final stages of production. If all goes well, it will be available for preorder on December 9 from Amazon and the publisher, Focal Press,
The Darkroom Cookbook 30th Anniversary Edition. The book has a lot of new material, and most, if not all, errors found in previous editions have been corrected.
For those involved with alternative processes, I have rewritten the chapter on enlarged digital negatives to make it easy to follow and create negatives the first time. Mark Osterman contributed a chapter on making a silver gelatin emulsion; Ed Buffaloe contributed a chapter on solarization, and a new chapter on master photographers' printing methods. I have written in-depth about the differences between sharpness and fine grain and how to achieve one or the other. There is a section on using LEDs for enlarging and another on split-printing from the out-of-print
Variable Contrast Printing Manual, which has also been included. Importantly, there is a revamping of the Formulas, with formulas I feel are no longer of value removed and new formulas included.
If you use the DCB in your work, I recommend that you update to this edition.