What is PEC-12 ?
PEC-12 is a waterless Photographic Emulsion Cleaner which is suitable for use on most film and print emulsions. It is a blend of organic hydrocarbon solvents with a neutral pH and is free from chlorofluorocarbons and chlorinated hydrocarbons. It dries instantly, leaves no residue and meets archival needs. Because it contains no water, PEC-12 will not cause emulsion swelling, tackiness, water marks or other damage associated with re-washing.
PEC-12 is designed to remove non-water based stains, grease and inks from photographic emulsions and bases. It removes finger oils, grease pencil, adhesive tape residues, mildew, smoke and soot damage, gold foil stamp and most ball-point and permanent inks. It will aid in the removal of firmly affixed adhesive tape. Graphic arts applications include the easy removal of wax and rubylith.
How safe is PEC-12 ?
PEC-12 is safer to use than most other hydrocarbon solvents. It contains no halogens which cause ozone damage and no known or suspected carcinogens. It is less hazardous to health than solvents used in office copier toners. It is also less toxic than many organic solvents found in the typical home. PEC-12 is extremely stable and has an indefinite shelf life when kept in its original capped container.
Like most solvents, PEC-12 is flammable. It must be kept away from open flames and sparks. Do not use in any areas which lack adequate ventilation. Individuals with asthma or other breathing difficulties should avoid inhaling PEC-12 or any solvent vapors. While excessive inhalation may cause dizziness and nausea, a headache will be experienced long before these more serious symptoms occur. At the first sign of a headache, discontinue use and seek fresh air. A headache is also an indication that the ventilation in use is inadequate for ANY darkroom use!
PEC-12 is hygroscopic. It will absorb moisture from the air if left uncapped. This will be evident if PEC-12 begins to wet and swell an emulsion. Discard immediately, by placing the open container outside until it has evaporated. Because PEC-12 is effective at removing finger oils from photographic emulsions, it is only natural that it will dissolve these oils from your skin! This can cause irritation and rashes in individuals with sensitive skin but otherwise will cause only mild dry skin after continued and prolonged exposure. Those with chronic skin conditions, such as eczema should avoid direct contact with PEC-12 for this reason. It will sting open cuts or abrasions. A good quality plastic examination glove should be worn to avoid skin contact should any difficulty be experienced.
On what can PEC-12 be used?
PEC-12 has been tested by an independent organization concerned with photographic preservation. It found that PEC-12 will not cause any hidden or long term damage to photographic images. It has no adverse effects on long term B&W or color
image permanence or on dye stability.
Read the report here.
Copies of these findings are available upon request. Beware of products sold for cleaning photo materials which contain peroxide formers (read the Material Safety Data Sheet (MSDS)). These chemicals react with any moisture in the air to form hydrogen peroxide, a strong bleaching agent which can irreparably destroy (by bleaching out) an emulsion. (The real danger with these products is that by the time the damage is discovered, it’s too late to save the image.)
PEC-12 will damage certain materials such as non-hardened gelatin or albumen emulsions and many dye-sublimation materials. Care should be taken whenever using this product on a print or film of unknown nature, including older B&W and newer B&W processed by “Fine Art” photographers. A safety test should be done on each print or film emulsion as described under the heading “When NOT to use PEC-12″.
When to use PEC-12?
It will remove a wide variety of non-water-soluble residues from photo materials, leaving them grease, oil and ink-free. Among the materials on which PEC-12 can be safely used are: All modern hardened gelatin films, both B&W and color (including, but not limited to C-41, E-6 and K-14 processes); All modern hardened gelatin prints, both B&W and color, on fiber, resin coated, and polyester bases. This includes prints made with EP-2, RA-4 and Ciba (Ilfo)chrome processes.
PEC-12 should be used sparingly; a little bit goes a long way. In most cases, there is no need to apply it directly onto the photo or film. Apply a drop or two onto a PEC*PAD, cotton swab or pad. Don’t drench the applicator with PEC-12 which will waste the solution and will not increase effectiveness. If excessive amounts are applied to an emulsion, there may be a white haze left on the surface when the PEC-12 evaporates. The haze is not harmful and can be easily removed by using a new applicator with less PEC-12. (The haze doesn’t generally appear on prints, and if it appears on a slide/negative, it won’t generally print.)
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 Petri 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.