What is transparent painting and "optical grey"

Transparent painting is a relatively old painting technique known as easel painting, dating back to the early century. It is a traditional painting technique in Europe centuries ago. Transparent painting is mainly for color cover dyeing, so that the two colors through visual harmony to produce the first color, it and the physical harmony derived from the first color although the same hue, but the visual effect is not the same, the former is deeper, with jewel-like luster. For a long time, oil painting hand painted oil painting oil painting hand painted oil painting has an extraordinary development speed, and I believe that the future will be as strong as ever. https://www.painting-portrait.com
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In the process of painting using transparent painting, the sketch relationship of a painting is completed without the use of color. The so-called non-use of color refers to the determination of the composition and the sense of volume of the image in a monochromatic and high-profile form. Then, add the color as a transparent thin or glossy color.
Transparent painting methods include:
(1) Transparent color redisplay. Generally, in the background and the dark part of the subject matter, the oil color with uneven powder or less powder is covered with multiple layers to reveal the fabric and the background color.
(2) Thin bottom transparent cover color. Paint a more strict plain oil painting with dark brown or silver gray on the grayish brown background in the middle tone, and cover it with transparent color after drying. Avoid excessive transfer of transparent color into white, so as not to affect transparency. For this reason, the plain oil painting on the bottom needs to improve the brightness in advance, leaving room for multiple layers of color.
(3) Thick bottom transparent cover color. Refers to the smooth surface of the bottom painting and the surface of the bottom painting. Thick smooth surface refers to the first thick color to dry before smoothing, dry cover transparent color. This method is mostly used in classical oil painting. For example, the light-affected part of the skin is heavily coated with pigments to distance it from the thickness of the dark part such as the background. When the thick paint is not dry, the brush is gently swept to smooth the brush, and then the transparent color is covered after drying, which can achieve the effect of both thick and transparent crystal.
Optical gray is a kind of visual effect expressed by transparent painting. Ancient artists glaze with resin gloss on a Tampera or oily color base, and apply a transparent or translucent covering layer, so that the various layers are revealed by overlapping, that is, produce a transparent gray optical gray of strange color. The visual effect of this transparent gray is not the same as that of the blended gray. It's achieved by direct drawing. Rubens, who at the time was known for creating optical grey, told his students that at least the darker part should be transparent.
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