October 28, 2009

Gessoing Painting Panels




Painting with egg tempera requires working on a hard surface; tempera requires an absorbent ground which traditional gesso provides; the gesso is brittle and would crack on a flexible support like canvas. So I have a friend who is a former cabinetmaker build these panels for me in the sizes I require. The surface is medium density fiberboard which is cradled on the back to keep the panel flat. Last night I sized the panels with a solution of food grade gelatin and water in preparation for the gesso today. Many painters use rabbit skin glue, which also works well, but I find the gelatin works well and is easy to store and measure. I prepare a few panels at a time, unless I have a very large one.






Above is the first coat of gesso, made with the gelatin size mixed with chalk. I usually rub the first coat with my fingers to spread it and remove any air bubbles. Subsequent coats are carefully painted on with a wide brush. The gesso coat is allowed to dry between coats only till the shine is gone from the surface, which can take from 15 minutes to an hour or so. When I have the woodstove going, on a day like today, the room is very warm and dry so the process goes more quickly than it would during a humid summer day.






I put 6 or 7 coats of gesso on the panels; it has to be thick enough to leave plenty of material after the panels are sanded smooth. After sanding, the painting surface is silky smooth, with a luscious sensuous feel. Working with egg tempera requires some preparation of panels and pigment, but this enriches the entire painting process; I am physically engaged with the panels and see pigments in their powdered form before they become paint. This making-by-hand of the elements of a painting, which is itself a very hand made object, seems almost medieval. I love these jarring inconsistencies: blogging about traditional pursuits, painting machinery using an ancient medium.

7 comments:

  1. the surface on those finished panels is so enticing, inviting - yet were I offered it, I would be intimidated - anything I put there would ruin the beautiful surface. which is no doubt another reason why I opt for the endlessly erasable screen.
    about the sizing. you mean gelatin I buy for jello is size? what IS size? I sometimes use a PVA size on paper - I could use gelatin instead?

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  2. Size is simply a glue solution used to isolate the panel (or canvas, for oil painting) before putting on the ground, which in this case is gesso. Yes, I use ordinary Knox unflavored gelatin. I imagine the gelatin would have a color cast on paper that might not be desired, so you should probably stick with the PVA.

    A gessoed panel is erasable too; just use water.

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  3. I use a gesso ground on (homemade) basswood panels for silverpoint -- never thought of using my fingers for the first coat! Brilliant. Or using gelatin instead of hide glue -- of course it's the same stuff, basically.

    But the part I haven't figured out is a good way to frame these panels -- with just the gesso & silverpoint drawing on them, they are so fragile and pale; I hate to cover that wonderful surface with glass, but they need some protection from fingers, dust, and so on. It's a puzzle.

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  4. If I were you, Susan, I'd frame those drawings under glass; they're just too delicate to take a chance. I used to do a lot of painting with gouache, and also hated putting that lovely matte finish under glass, but there was no choice. Egg tempera, though, is actually pretty tough; it resists water, though it's not as waterproof as oil paint, and when the surface dries thoroughly it gets fairly hard.

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  5. Thank you. Good advice! I was thinking maybe something like a shadow box would be best, since I gesso the sides too, and they're about 3/4 inch thick.
    When I studied egg tempera with some Russian icon painters (thirty years ago), they finished off the paintings with linseed oil. Do you still only burnish yours, as you wrote about?

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  6. Susan, I didn't realize the panels were so thick. I wonder if some kind of non-yellowing varnish, plastic based like Soluvar, might be a good way to finish the work. It would be best to confer with a restorer, or someone who really knows about this, which I don't.

    I still just burnish my paintings; they're fine with that unless someone handles them poorly and mars the surface. This rarely happens. Linseed oil would yellow terribly, but an icon painter might like that look.

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  7. Altoon, it's so nice to see a post showing the panel making process. I have not had the patience, and it's not an ideal scenario in a NYC apt. to make my own gesso, so I order my panels from several different sources, including an icon supply company, that I feel happy with. I know a number of fellow painters however who really enjoy the craft of panel preparation. Interesting, too, to hear about different methods, like the use of gelatin.

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