Pyro and Platinum Printing
is a .pdf file of Bob Herbst’s “Appendix D” to the Second Edition of Dick Arentz’s book Platinum and Palladium Printing (2005, ISBN 0-240-80606-9, Focal Press).  Dick Arentz invited Herbst to write the appendix because of his work in understanding how the stain of a pyro negative affects exposure in the making of platinum/palladium prints.  The .pdf file is available for  download by clicking its title or the picture next to it.

Calibrating Photoshop Curves for Digital Negatives Using a UV Densitometer
is a presentation delivered by Bob Herbst at the Alternative Process International Symposium (APIS) in 2005.
The .pdf file is available for  download by
clicking its title or the image next to it.

Bob Herbst’s Articles On Unblinking Eye

The Effects of Pyro Stain in Platinum Printing - Demonstrates that a longer printable scale is obtainable with pyro negatives for both platinum and silver printing.

Enlarged Negatives using APHS Ortho Film and Pyro Developer - Reprinted from the May/June 2002 View Camera.

A Densitometer for Reading Pyro Negatives - Reprinted from the March/April 2003 View Camera.

Azo and Amidol - There is only a half-stop difference between images printed on Azo and images printed in platinum.

 
www.bobherbst.com