with oil paints ,some colors are naturally transparent.(oxides,lakes,etc.) The 15th + 16th Century Masters knew that in order to give these colors their maximum luminosity, and take full advantage of a wide variety of tones and tints with each pure color, these could to be layered ,one upon the other ,over a completed underpainting,which was highly charged in the light,(using lead white),and even the shadows would be be softly veiled with translucent white, ,creating a range of optical greys....These first layers were executed in tempera(egg), and created the forms and textures of the subject, which could be seen through the subsequent transparent colors(glazes)
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