Quote Originally Posted by Annie
The purported more predictable ammonium iron (iii) oxalate coupled with the print out process by inspection without calibration... appeared particularly alluring... especially the 'without calibration' aspect... but then I too wondered why most printers appear to be using variations of Arentz's methods. Has anyone done comparison prints by the two methods... is there something on the internet that shows comparative examples?
I have not seen any comparisons. Although I have tried making ziatypes. Given my succesful failure with ziatypes I was not about to try the Ware-Malde process which seems to be even more dependent on the paper humidity.

IMO I think many of us doing pt/pd are a little bit more secure with a concrete methodology than with just trial an error. Not being able to control the paper's humidity would probably drive me crazy.