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The ISO rating of a film is determined by the exposure required to produce a negative (or positive, in the case of slides) with a particular contrast level when the film is developed according to a standard recipe and process (time, temperature, etc.). Simply put, "push processing" is developing a film for longer than normal; "pull processing" is developing ...

It's a process similar to that used to photographically create screen prints (serigraphs). A UV-photosensitive water-soluble emulsion (typically gelatin sensitized with potassium dichromate) containing a pigment (in this case, carbon or lamp black) is used to coat a surface. The emulsion hardens under exposure to strong UV, becoming more-or-less insoluble ...

A good tutorial on making digital negatives using The Gimp. A free image editing software platform. http://www.alternativephotography.com/wp/negatives/digital-negatives-gimp You can make them on your computer and then print using any printer you have. Not sure why you mention your printer? Maybe some printers have this option built in?

Alternative Photography, which is on Google's first page, is still one of the best resources I know of for alt-process photography, so I'll recommend it anyway: http://www.alternativephotography.com/wp/processes/wetplate/the-wetplate-collodion-process The forums at f295.org are low-traffic, but generally helpful and knowledeable, and don't show up for the ...