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Transparent painting is the oldest known painting technique of easel painting,Great Big Canvas dating back to the 15th century.
It is a traditional painting technique in Europe before the 19th century.
Transparent painting method basically is to undertake colour cover is dyed, make two kinds of color produce the 3rd kind of color through vision harmonic, although the 3rd kind of color that it and physics harmonic derive have same hue,
but visual effect is different, former more deep, have gem like burnish.

In the process of using transparent painting, the sketching relationship of a painting is completed without using color.
The so-called does not use color,Big Canvas Art  refers to the monochrome high-profile form of the composition and the volume sense of the image down.
Then, add the color in a clear, thin or gloss.

Transparent painting includes:

(1) transparent color reproduction.
In the background and the dark part of the main body of color with or less tone powder color for multi-layer cover, revealing the cloth and background color.

(2) transparent cover with thin bottom.
On the grey brown bottom of intermediate cadence with dark brown or silver-gray, draw a stricter plain color oil painting, after waiting for dry cover transparent color, transparent color avoids overmuch tone white, lest affect
For this, the plain oil painting that bottom draws needs to raise lightness in advance, leave room for color of multilayer cover.

(3) thick bottom transparent cover.
Refers to a transparent color on a thick, smooth surface and a smooth,Large Canvas Art concave surface.
Thick smooth surface refers to the first use of thick color when not dry, dry after the cover transparent color.
This method is mostly used in classical painting.
For example the skin receives light part multi-purpose thick besmear pigment, make its and the thickness of the dark part such as the background is opened a distance.
When thick paint is not dry, use brush to sweep gently smooth brush stroke to carry on smooth processing, after drying, cover transparent color again, can achieve the effect that is both thick and transparent crystal.

"Optical grey" is a visual effect of transparent painting.
After glazing with resinous gloss on tampera or oil base, the ancient artist applied a transparent or translucent covering layer to expose the colored layers through overlapping, which produces a bizarre transparent grey - "optical
This transparent grey has a different visual effect than the blended grey.
It's something that you can't do directly.
Rubens, who was known at the time for creating optical ash, told his students: "at least the last layer of color in the dark should be transparent."
Figure 29 is part of Rubens' painting.