Lith printing techniques

In order to make successful lith prints you must use a chlorobromide-based black and white paper. This paper gets it name from the way in which the emulsion is made. The emulsion contains a ratio of chloride to bromide of approximately 60% silver chloride and 40% silver bromide. This type of paper, when traditionally developed, produces images with warm rich blacks and fine grain, and it is this paper that responds most predictably to the lith printing process.

Most companies that produce chlorobromide paper supply it in graded emulsions coated on fiber-based supports. Do not be too concerned about the grade of paper that you purchase as the contrast of the final print can be varied in the process. As a general guide, grade 2 paper would be a good starting point; however, grade 1 or 3 could also be used if 2 is unavailable.

You will also need a high-contrast lith developer. Lith developers are used to process high-contrast film separations for use in the printing industry and for masking and slide titling in the photographic industry. You can use your normal stop bath and fixer for the rest of the lith printing process, but remember to adjust your fixing and washing times to account for the difference between fiber-based and resin-coated papers.

Figure P.3 Lith printing process.
0 0

Post a comment