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Rochelle,
Actually, sometimes I start out my charcoals with sauce. I start with a "stain" of sauce over the entire surface of the paper. That way I am not starting with a white paper, but a 2 or 3 value paper (on a scale where white is 1 and black is 9). I can erase to achieve the lightest values. This gets you "there" faster.
The sauce "pounce" goes on incredibly smoothly, while the charcoal goes on grainier. I do the drawing in charcoal, because you can't erase the "drawn" sauce, and work out the detail and placement. From there, you really have to make the discussion. Charcoal doesn't mix with water. What I like about the sauce, is that it is all the same stuff. Wet and dry. So there is no problem with working back and forth.
I don't even mix charcoal brands, because they will not mesh, and I like a seamless drawing, not where one charcoal is warm and light, and the other is cool and dark. I guess that is why I don't do mixed media.
But to start with a charcoal drawing and switch to sauce for the value punch, I think would be very difficult, because of the graininess of the charcoal. You could try it! I've only come this far with sauce because I experimented. There were certainly no rules to follow....
I have a friend who has done tremendous drawings using sauce, (which comes in different colors...) as a grisaille under his pastels. Amazing work!
Peggy
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