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The Statue of Liberty, showing advanced patination; verdigris is responsible for the statue's iconic green colour.. Verdigris (/ ˈ v ɜːr d ɪ ɡ r iː (s)/) [1] is a common name for any of a variety of somewhat toxic [2] [3] [4] copper salts of acetic acid, which range in colour from green to a bluish-green depending on their chemical composition.
The medium, base, or vehicle is the mixture to which the dry pigment is added. Different media can increase or decrease the rate at which oil paints dry. Often, because a paint is too opaque, painters will add a medium like linseed oil or alkyd to the paint to make them more transparent and pliable for the purposes of glazing.
Strip linings can be added to reinforce the margins of a painting. This practice is important as the margins of a painting are often more damaged than the rest of the canvas. [2] Strip linings strengthen the edges of the canvas so that they can withstand re-stretching. Both strip lining and patching are less invasive than lining.
The most common method of adding the black linear painting necessary to define stained glass images is the use of what is variously called "glass paint", "vitreous paint", or "grisaille paint". This was applied as a mixture of powdered glass, iron or rust filings to give a black colour, clay, and oil, vinegar or water for a brushable texture ...
The Vinegar Tasters (三酸圖; 'three sours'; 嘗醋翁; 'vinegar-tasting old men'; 嘗醋圖, 尝醋图) is a traditional [clarification needed] subject in Chinese painting, which later spread to other East Asian countries. The allegorical image represents three elderly men tasting vinegar. The identity of the three men varies.
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A completely unrelated type of "encaustic painting", not involving wax at all, is found in British ceramics, after Josiah Wedgwood devised and patented the technique in 1769. This was a mixture of ceramic slip and overglaze "enamel" paints used to imitate ancient Greek vase painting , and given a light second firing.
This is often the case with the fading or disappearance of fine detail, such as faces, in figural stained glass art (fig. 2). Over time, enamels can begin to flake off of glass panels, and certain types or colours of stains can discolour with continued UV exposure, all of which significantly alters the aesthetic impact of the work as a whole ...