Mordançage is considered by many to be a specialized, even secretive, alternative process. Through this process, the artist has the power to manipulate the print by physically lifting, repositioning, and securing the pure black portions of a black and white darkroom print. This magical alchemy helps add to the mystique and unique quality of this distinct process.
Mordançage (pronounced more-dawn-sahhhjeh) was called by several different names when Paul Liesegang (1838-1896) originally discovered it in the late 1800s: bleach-etch, etch-bleach, gelatin relief, and reverse relief are some of the terms used. A method of reversing a film negative to a positive using an acid-copper-bleaching solution, the process was originally designed to be used on film and not paper.
Later, photographer Jean-Pierre Sudre (1927-1997) coined the term ‘Mordançage’ and turned the process into an art form using photographic prints instead of negatives. In the darkroom, through a series of chemical baths, the artist manipulates the print by physically lifting, repositioning, and securing the pure black portions of a black and white print. Sudre is best known for both his experimentation with chemicals and chemical processes in his still life and landscape imagery.
Professor Craig Stevens, a student of Sudre’s from my alma mater, Savannah College of Art and Design, refers to the current incarnation of the process as, “Mordançage – As perfected by Jean-Pierre Sudre.” At the very least, Sudre considered his use of the process “proprietary,” thus setting the tone for other practitioners of the process. Today Mordançage is considered by many to be a specialized, even secretive, alternative process, which helps to add to the imagery’s mystique and unique quality.
The Mordançage Process
Materials/Supplies:
- Wear old clothes or an apron because the solution will discolor and eat through fabric. Wearing a mask and gloves is an absolute must.
- Nitrile or dishwashing gloves
- Mask
- Print developer (expired or new – most brands work, my preferences are Ilford and Sprint)
- Cotton balls/Q-Tips/small brushes
- Fiber photographic paper (RC works too but I prefer fiber)
- Flat bottomed trays and ribbed developing trays
Chemicals for the Mordançage Process
- 750 ml distilled water (cool or cold);
- 10 grams of copper chloride – I order mine from Bostick and Sullivan. They are the absolute best and have wonderful customer service if you have questions;
- 50-75 ml – hydrogen peroxide (40 or 100 volume) – where I am, 100 volume is only available to cosmetologists, but 40 volume is available to the public. I have a stylist connection (shh 🙂 )40 volume works fine and even can provide better veiling; it just takes a little longer;
- 50 ml – glacial acetic acid – this is available at any photochemical retailer;
- More distilled water to make one liter.
- Mix the chemicals in this precise order AAATW (Always Add Acid To Water). I did this incorrectly once and had to evacuate my apartment until the dangerously, noxious, turquoise smoke cleared.
The Mordançage Process
The best images for this process are ones with rich blacks, such as dark backgrounds that also have some lighter tones or intricately detailed patterns. In my experience and in my classroom, I encourage students to try to integrate content with this process, so it doesn’t become one more meaningless technique. The process lifts in the blacks; if your image does not have a strong, bold black then it will not work!
2Soak prints in a tray of water.
The tray should be larger than the print to allow for adequate agitation. The more saturated the print the quicker the print accepts the chemicals.
5Put print in a tray of developer and agitate until the desired tone is reached. The print is pretty fragile at this point, so treat it tenderly.
6Allow print to drip and then put print in a flat bottomed tray. If you don’t have a flat bottom tray, try a piece of Plexiglas. The important thing is that the surface is completely flat; ridges will interfere with the process at this point.
[I have fully lifted pieces of emulsion in a small bowl of water so I can add them to areas that either need a little extra help or to small areas that ‘goof’ or just to build up density.]
Steps #4 and #6 can be reversed if you prefer a cleaner working environment. You can also rinse and re-bleach the print if the effect is unsatisfactory.
Be prepared to have a mess on hand. The emulsion will lift off the base and leave bits of stuff floating in your trays that stick to everything when it dries. The emulsion will have the consistency of egg whites.
8Remove the print and fully inspect.
Fix the print for 3 minutes, then wash it for 10 minutes, and air dry;
OR
Allow the print to oxidize by not fixing or washing it and simply air dry;
OR
If you are trying to ‘veil’, use a hairdryer to dry the print in order to solidify the veils.
Keep an eye on the image in the initial drying stage: you may need to blot out puddles (These tend to dry terribly…blot!). Upon drying, the gelatin will re-adhere to the surface and become solid.
- Complete rubbing produces a reversed or more negative image, but often, some positive remains because the original highlights in the print usually don’t dissolve.
- If there are large areas of darks in the print (e.g., a black background), with strong enough peroxide these areas become wavy, like veils. If you are careful with your rubbing and washing, these veils can remain attached, albeit tenuously, to the points of contrast between the more anchored highlights and the detached shadow areas.

Adopt the attitude of embracing the unpredictability of the process and its results. The process is imperfect, messy, and unpredictable at times, but it is also beautiful, seductive and satisfying.
A note on Cara Lee Wade’s Insidious Charms
Throughout history, women have put their bodies, and their psyches through tortuous measures trying to live up to the elusive thing that is beauty. We have constricted our breathing and injected ourselves with poison. We have teetered precariously, balancing on minuscule pedestals and we have crafted our flesh into contours deemed acceptable.
“Not only do I fear and rage against this but also grudgingly embrace it. I am left with a love/hate relationship with the idea of beauty and the quest to attain it. These images have emerged from this dichotomy.”
In the darkroom, I collage images from fashion and bridal magazines – images of women who— through the magic of editing and digital enhancement—don’t exist. Then, through a 19th century Victorian process called Mordançage, I merge representations of these accepted and established notions of what is beautiful with those of my manufactured grotesque. I create imagery that seeks to glorify and rebuke, ultimately giving way to a different definition of beauty, one of engaging oddity and lush ambiguity.








