In a glazed painting you only see the top layer; here's a few underpaintings showing the value study underneath...i think the trick is to make the whites on the underpainting strong enough to serve their intended purpose; to reflect light back into the eye of the viewer...for my white here i'm using Gamblin Artists Colors, fastmatte titanium white(it's a fast drying oil with the properties of egg tempera (opaque)
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