Red and Blue

by Gordon

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Picture Perfect 2400-A Juan Tabo Blvd NE Albuquerque, NM (505) 299-9594 120/220 & 35mm color and black & white film processing Film and Transparency Scanning (any size) Bulk Scanning Digital film restoration See the website for more services and mail-order instructions: www.pixperf.net


5

Xtol is less stable and is liable to fail without giving notice. Other than that, it's got an excellent reputation. Kodak provides this comparison between its developers: The main difference between D-76 and Xtol when you develop at rated speed is the fineness of the grain. The other metrics (shadows detail and sharpness) are very much in line. Of ...


2

ISO (R) is not a speed number, it is log exposure range required to give the full tone (that is, full density range). The higher is the ISO R number, the softer is the paper. ISO R = 160 means density range = 1.6, or log2(10^1.6) = 5.3 stops. You may see it as "paper dynamic range under standard development". ISO R is used because contrast grade is in fact ...


1

Looking at http://www.firstcall-photographic.co.uk/userfiles/file/faultsonblackandwhitenegatives.pdf and http://www.olympusmicro.com/primer/photomicrography/bwprocessingerrors.html it could be one of the following things (or even combinations thereof): Underexposure Underdevelopment Inadequate fixing Variations in processing temperature (reticulation) If ...



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