Response to Do films developed in PMK need cold light?

Like with any other film/developer combo, you must calibrate your exposure and development to your enlarger light source. If you use a cold light head, you can develop your film to a slightly greater contrast range. The pyro stain will inhibit some wavelengths of light (typically blue), so it may throw your filtration off slightly for variable contrast papers, but this is usually not a problem--you can adjust developer or development time, if necessary. The stain also enhances contrast, so pyro negs are often thinner than conventional negs, but still print normally. You can see through even the darkest areas of the pyro neg, assuring printability and separation in the high values.

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