Step 7 (or 8...)I've gone about as far as I want to with the underpainting. A little more umber, white, black, and Venetian red casein. I could probably take it a bit farther, but, as is usually the case, I stopped when I became impatient to work in color. So, the next step is to brush over the entire surface with a dilute egg yolk wash (around 8-10 parts water: 1 part yolk) to seal the surface somewhat. The casein surface is fairly "thirsty." If I prime the underpainting with a little egg, the tempera goes on easier in the early passes.
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