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Watercolor ground is acrylic with some kind of absorbent stuff in it, usually wood pulp or similar. When the acrylic dries it is a plastic so it seals the paper, but it has pulp so it's absorbent and watercolor binds to it. That lets you layer watercolor AND remove it.
Now, because the ground is a plastic and because it lets you remove easily, it does mean that the under layers of watercolor will lift easier, so it makes the problem of layering worse. Sure, the paper holds up, but now when you paint each layer lifts some of the lower layers.
Enter Shellac Soap: It's shellac varnish, but it's like a soap so it mixing in with water. Shellac is basically bug guts and is water soluble, so put a bit of that in some clean water and you've got yourself a varnish in your binder. Now each layer goes on and stays on.
But, the Shellac isn't ultra permanent like say acrylic is. You can still get it wet and remove it, it's just that *more watercolor* won't take it off. You don't even really notice it's in there, except that the watercolor film is a little waxy and seems to hold better.
THIS then gives me an idea for my next experiment: Watercolors are very delicate, so you have problems shipping them and have to put them under glass making them hard to see. What if! You use the watercolor ground on a piece of aluminum, shellac soap, & varnish with acrylic?
In theory this would make it permanent, and might look very interesting. One thing varnish does to a watercolor is make it a lot darker, so I'd have to experiment, but I may try it on a large version of this Tblisi painting.
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