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The color is added slowly. It takes a long time to build up all the layers, but it definitely adds a depth and detail that can't be achieved otherwise. The pic above is two or three layers of glazed color. I glaze with straight liquin as the medium, usually.
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You can see some differences in this pic from the previous. This is about two additional layers worth. Each layer takes about 48 hours to dry. Like I said, it takes a long time. A great glazing trick is to wipe the entire panel with a very thin layer of cold pressed linseed oil prior to painting.
More color to come...