Mike,
That's a very good question. I know pastel is water soluable, and that I played with that feature in the pastel drawing I have above for critique. Wetted pastel, though is erasable, even if it involves more elbow grease than dry pastel. Dried wetted sauce is harder to erase.
The plus of sauce is most apparent with people who like to work with a light touch. I'd like to see a sauce pencil. It is far easier to remove than to apply sauce. Where I got the sauce wet, as, for instance, in the little floral thingies in the blouse, I was able to put more sauce over that and remove the excess without bothering the previously wetted sauce.
It'd be worth trying out: doing a pastel or charcoal using the same approach as with the sauce. I have to give it a go. Maybe the sauce effects can be had with pastel or charcoal, if the work is approached in the same way. Hm!
Well, like I said at the top, you posed a very good question.
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