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Gouache

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Gouache is a unique type of water-medium paint known for its opacity.

Gouache
Gouache

While watercolor is often thin and transparent, gouache is designed to be thick and solid. This characteristic allows artists to hide layers underneath or create very bright, flat colors. Because it is water-based, it can be rewetted with water even after it has dried. Once it is fully dry, it typically leaves a matte finish on the surface. This combination of qualities makes it a versatile tool for many different creative styles.

To understand how gouache works, we must look at its specific chemical makeup. It consists of natural pigment, which provides the color, and water. A binding agent is also necessary to hold the pigment particles together. Traditionally, artists used gum arabic, but many modern or cheaper versions use a substance called dextrin.

MET 24 DP238441r2 61E
MET 24 DP238441r2 61E

To make the paint more flexible and help it stick better, manufacturers often add propylene glycol. This additive helps prevent the paint layer from becoming too brittle once it dries.

Gouache differs from standard watercolor in several technical ways. First, the pigment particles in gouache are typically much larger. Second, the ratio of pigment to binder is much higher than in watercolor. Third, many gouache formulas include a white filler, such as chalk, which is often called a "body."

Jacob Philipp Hackert - Lago d'Averno - WGA11023
Jacob Philipp Hackert - Lago d'Averno - WGA11023

These additions make the paint heavier and more opaque. This extra density also gives the paint better reflective qualities when it is applied to a surface.

Working with gouache requires a specific understanding of how colors change during the drying process. When the water evaporates, the value of the color often shifts. Generally, lighter tones will dry to become darker. Conversely, darker tones tend to dry to a lighter shade. This can make it quite difficult for an artist to match colors perfectly across different painting sessions. However, its ability to cover surfaces quickly allows for more direct painting techniques than watercolor.

The history of gouache spans at least twelve centuries. Ancient Egyptian painters used a version of this medium with binders like honey or tragacanth gum.

MET 24 DP238441r2 61E
MET 24 DP238441r2 61E

In India, it was used for Buddhist manuscripts, and it was also central to Persian and Mughal miniatures. The word "gouache" actually comes from the Italian word "guazzo," which means "mud." In the 16th century, this term described applying oil paint over a tempera base to create a matte effect. By the 18th century in France, the term specifically referred to opaque water media.

Technological changes in the 19th century helped make gouache more accessible to everyone. In 1841, the invention of tubes allowed watercolor and gouache to be packaged for easy use. Later that century, mass-produced "poster paint" became available in cans or powder. This version used the cheaper dextrin binder instead of older materials like hide glue. Today, gouache is a staple for commercial artists working on posters, illustrations, and comics. It was even essential in 20th-century animation to create opaque colors on cels.

Artists use gouache in many creative and surprising ways. While most use a brush on watercolor paper, some apply it with an airbrush. The medium is so adaptable that it can be used on cardboard or even Braille paper, as seen in the work of Vienna Parreno. The famous artist Henri Matisse used a variation called "gouaches découpées," or cut collages, for his Blue Nudes series. There is also a modern variation called acrylic gouache. This version uses an acrylic-based binder instead of gum arabic. It remains water-soluble when wet, but it dries to a water-resistant, matte surface.

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File:Gouache.jpg
Gouache.jpg
File:Jacob Philipp Hackert - Lago d'Averno - WGA11023.jpg
Jacob Philipp Hackert - Lago d'Averno -...
File:MET 24 DP238441r2 61E.jpg
MET 24 DP238441r2 61E.jpg
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