Oil Paints


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Oil Paints

 

suspensions of inorganic pigments and extenders in drying oils prepared from vegetable oils with sufficiently high drying properties or from oily alkyd resins. Pigments include titanium dioxide, ocher, Indian red, chrome oxide, and chrome yellow. Talc, kaolin, mica, and other extenders are primarily used to economize on pigment use. Other components of oil paints are siccatives and surface-active agents. Siccatives are soluble in drying oils formed from cobalt, manganese, and lead salts. Surface-active agents are used during the preparation of the oil paints to dilute the pigments and extenders.

Two types of oil paints are produced commercially: thick-milled (pastelike) and ready-mixed (liquid). The manufacture of thick-milled oil paints involves the preparation of a homogeneous pigment paste in a mixer, followed by grinding in a mill. Ready-mixed oil paints are produced by mixing all the components in a ball and pebble mill or by diluting thick-milled paints with a drying oil. Oil paints are applied to a surface by brush, roller, or spray. The oxidative polymerization of the vegetable oils causes a film to form as the paint dries. The rate of drying and the properties of the film are dependent on the type of oil and pigment used, as well as on the drying conditions (temperature, lighting). For example, films formed at room temperature are not hard, have poor water resistance, and disintegrate upon action of alkalis. The properties of the film improve at higher drying temperatures. For example, films dried at 250°-300°C are stable in diluted alkaline solutions. Easy to use and inexpensive, oil paints are mainly used for painting walls, roofs, and other large surfaces.

In addition to all-purpose oil paints, those used in the fine arts are important. These paints are prepared by grinding pigments in bleached, refined linseed oil (sometimes with additions of walnut and sunflower oils). These oil paints are applied to primed canvas or wood.

References in periodicals archive ?
Years of neglect and improper care resulted in the discoloration of the oil paint and metallic leafing used to compose the mural.
She wanted the background to appear burnished, so she tacked a piece of canvas to her studio wall, brushed on a wash of oil paint, balled up a wet rag and began to rub the paint around.
The beauty of oil paint is that you can wipe it off, scrape it off with a palette knife or paint over it.
Max is also used by teachers and students in classroom situations where harmful vapors accumulate with the use of traditional oil paints.
Oil paints were used on non-absorbent surfaces, concealing much of the image underneath; other surfaces were absorbent and could be delicately tinted with transparent colors.
New Artists' Oils Painting System - A milestone in the evolution of digital art, this new painting system creates a new level of realism for digital painting, delivering oil paints that truly behave like traditional media.
Students get creative with oil pastels, oil paints and acrylics by learning the latest techniques from Olenik.
For example, Tumosa recently reported that a heating protocol commonly used for artificially aging materials doesn't work well for oil paints.
A new, 13-part work cannot be remade: leftover oil paints that seem to have been spread on a piece of paper offer the starting point for photographing, selecting, projecting, transferring, completing, and rephotographing.
The water-based oil paints are AP-non-toxic and have all the qualities of a real oil paint, yet when watered down can be treated as watercolors, as in washes, wet-in-wet effects, etc.
Phthalic anhydride, a petrochemical product which is used as raw material for the production of resins and oil paints, also serves as a component of the polyvinyl chloride (PVC), which is used in plastic pipe production.