Gesso ( Italian pronunciation: Ã, ['d sso] ; " lime, "from the Latin: gypsum , from the Greek: ????? ) is a mixture of white paint composed of a binder mixed with lime, gypsum, pigment, or a combination of these. It is used in artwork as preparation for a number of substrates such as wood panels, canvas and sculptures as a basis for paint and other materials applied on it.
Video Gesso
Gesso tradisional
"Gesso ", also known as "gesso glue" or "Italian gesso" is a traditional blend of animal glue (usually rabbit skin glue), lime, and white pigment, used to coat rigid surfaces such as painting panels wood as an absorbent primer layer substrate for painting. Gesso colors are usually white or white. Its absorbency makes it work with all painting media, including water-based media, various types of tempera, and oil paint. It is also used as a base on a three-dimensional surface for paint applications or gold leaf. Mixing and applying it is an art form itself because it is usually applied in 10 or more very thin layers. It is a permanent and brilliant white substrate used on wood, masonite and other surfaces. The glue mixture of the standard hide is somewhat fragile and susceptible to cracking, thus making it suitable for rigid surfaces only. For flexible flexible canvas, ginger and linseed oil emulsions, also called "half-lime soils", are used. In geology, Italian "gesso" corresponds to the English "gypsum", as this is a mineral calcium sulfate (CaSO 4 Ã, Â · 2H 2 O).
Use in sculpture
Gesso is also used by sculptors to prepare the last sculptured form (fused bronze) or directly as a material for sculpting. Gesso can also be used as a layer between carved wood and gold leaf. In this case, a fine, colored clay layer, called 'bole' is used to cover the gesso before applying gold. It's usually red.
Maps Gesso
Acrylic "gesso"
Modern "acrylic gesso" is a widely used soil which is a combination of calcium carbonate with latex acrylic polymer medium, pigments and other chemicals that ensure flexibility, and enhance the life of the archive. Technically not gesso at all and the non-absorbent acrylic polymer base makes it incompatible with media requiring traditional gesso like egg tempera. These are pre-sold for both sizes and priming panels and flexible canvas for painting. Although it contains calcium carbonate (CaCO 3 ) to enhance absorption of the primary coat, titanium dioxide or "white titanium" is often added as a bleach. This allows the gesso to remain flexible enough to be used on the canvas.
Acrylic gesso can be colored, either commercially by replacing white titanium with other pigments, such as black carbon, or by artists directly, with the addition of acrylic paints. Acrylic gesso may smell, due to the presence of ammonia and/or formaldehyde, which is added in small amounts as a preservative. Manufacturers of canvas art market market dipre primed with gesso.
The Painter's Handbook notes the problem of using oil paint on acrylic gesso soil instead of traditional oil soil, citing incompatibility in flexibility over time that can cause oil pain to be delaminated.
Gesso based soybean
Soy-based Gesso is a low bio-based "gesso" made from recycled soybean material. Gesso soybeans are made with bio-based dispersion technology using soybean esters with modified acrylic oil (soy) oil. Its surface is similar to acrylic gesso, but not solid acrylic. Gesso soybeans are made using thin films of modified acrylic and soy esters. The advantage of soy gesso is that the penetration and adhesion of the soybean ester to the substrate and modified acrylic thin film can create a surface that allows the physical bond between gesso and oil paint. In addition, thinner modified acrylic films are more resistant to cracking than solid acrylic gesso.
See also
- Primary (cat)
Resources and resources
- References
- Source
- "Galvanizing Enhancement Techniques" by Jerry Tresser, 1992.
External links
- Media related to Art created from casts on Wikimedia Commons
Source of the article : Wikipedia
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