For working on larger films or prints, use the larger size PEC*PAD or similar applicator. When using a PEC*PAD, simply wipe it across the film/print. (See the PEC*PAD specifications for complete instructions.) If using other applicators wipe the film lightly, turning the applicator to carry away the grime and bring clean PEC-12 to the emulsion. These other applicators will also require a final wipe with a clean applicator lightly moistened with PEC-12 to remove any lingering residue. The pad itself should look clean after this last application. In some instances, with slide or negative films, one may notice a slight coloring usually magenta (prints) or yellow/green (slides) being removed from the film and discoloring the applicator. This occurs because during processing the final wash tank was not supplied with adequate fresh running water allowing chemical carryover contamination. Any film passing through this wash is thus "contaminated" with residual chemicals. PEC-12 is removing this residual contamination from the film and actually improving image quality and permanence! PEC-12 dissolves only non-water based stains. If it is going to work on a particular stain, it will do so immediately. If there is no immediate effect, DON'T apply any pressure to the print or film. That won't work any better, and non-PEC*PAD applicators can scratch the image. An exception to this is cleaning adhesive residues, which may require several applications, a heavier dose of PEC-12, or a combination of both. But DO NOT RUB HARD in attempting removal. When cleaning anti-scratch, laser-separation oil, use PEC*PADs to remove any excess before applying PEC-12. The preferred method for cleaning film of these contaminants is to pour an ounce or so of PEC-12 into a very small tray or petrie dish. Immerse the film completely in the PEC-12, agitate LIGHTLY, and remove it after a few seconds. CAUTION: films immersed in PEC-12 for extended periods (several hours or more) may develop an excessive reverse curl. This method should also be used when removing lacquer from film (such as found on Kodachrome processed before 1970 ). Repeat this process of soak/agitate/wipe until all the oil, lacquer or adhesive has been removed. When the film dries there will remain the haze that results from over-application of PEC-12, which can be wiped off with a PEC-12 treated PEC*PAD. You can save the PEC-12 from this dish for future use (in cleaning the same contaminant) in a separate bottle. NEVER put used PEC-12 back into a container with unused PEC-12. PEC-12 is an excellent solvent for removing non-water-based inks and retouching dyes. Before applying it to a print or film, determine that the underlying work surface is not covered with paint or inks which are soluble in PEC-12. For example, the printed colors and text on most photographic film or paper boxes will dissolve in PEC-12; they could be picked up by stray solvent and stain the photo being cleaned. It's safest to work on an undyed and unpainted work surface when cleaning a film or print with PEC-12. Sheets of clean, white, acid free paper or museum board are ideal. PEC-12 will remove retouching colors if they are oil-based, and will have a minimum effect on water-based retouching dyes by removing only whatever dyes may be on the surface. Continued