This topic fascinates me. I keep coming back to it. I love the whole idea of painting a glow that surrounds a lit object against a dark background. I'm posting a head study I did almost a year ago, in which I used the optical red effect on the lit edge of his head and ear. As I was painting it I saw the color as the effect of looking through a foreshortened perspective of indirect, refracted light and seeing the resulting color as glowing in the air just at the edge.
I'm wondering what color red other people use for "optical red." What about you, Tony? (That's a beautifully painted head, by the way.) I was using Gamblin's perylene red.
Also, has anyone noticed other color variations of this halo effect? David Leffel often paints a whitish glow of light coming off the lit side of objects against a dark background. If I had his new book I woiuld try to find what he says about it, but I can't find the book--I think I lent it to someone. Does anyone have it? I think the color of the halo looks different under different conditions.
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