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No, the opacity I'm talking about is not that of language, especially as exemplified by politicians, contemporary art critics, and economists. They probably all could vie for the Opacitator of the Year award. No what I'm talking about is opacity in watercolor.
Some people will know what I mean when I talk about this and others will probably roll their eyes. The best example I can give of this is Winslow Homer. I'm rereading one of my many books on him right now and once again I notice that as I look at his watercolors chronologically that they are skilled, accomplished and then out of the blue one day, they are really exciting. That is the day he abandons opaque watercolor for transparent watercolor. Some of the paintings(for example Applepicking) he did at Houghton Farm in New York in the late 1870s before going to Cullercoats, England are good examples. He achieves brightness as though he were painting in oils, by putting the lightest colors on top. So many of the highlights are light colors laid on top of dark colors. But you can't do this in watercolors. Except you can. IF you mix some opaque white with your colors. The white is more or less a new paper background and any color on it will be brighter, not limited through transparency to any darker colors underneath. But it comes at a price. The sparkling, luminous, transparent effect of watercolor is gone.
Sometime after his return from Cullercoats, and certainly by the time of his Adirondack paintings of the late 1880s, Homer more or less abandoned opaque watercolor for transparent watercolor, regardless of cost or difficulty. The result is a body of work that sings, the watercolors for which he's most famous.
I've always disliked opacity in watercolor so I've avoided it. Until today. I just couldn't think of any other way to salvage the reeds in this painting and make them regain the foreground. The results are mixed and I might try a little more work on it. But largely it's done. I do think it looks better than yesterday but I've lost some of the brilliance that is the main reason for working in watercolor. Still it seemed worth trying, at least this once.