Artists’ oil colours are put together by adding dry powder pigments with special refined linseed oil until the mixture reaches a stiff paste texture and grinding it with harsh friction in steel roller mills. The perfection of the colour is important. The common feel is a smooth, buttery paste, not stringy or long or tacky. When a flowing or mobile quality is desired by the artist, a liquid painting medium such as pure gum turpentine needs to be stirred in with the mixture. In order to speed up drying, a siccative, or liquid drier, should be occasionally used.
Top-class brushes are available in two kinds: red sable (hair from different members of the weasel species) and chemically whitened hog bristles. They are produced in in numbered sizes for each of four regular shapes: round (pointed), flat, bright (flat but shorter and less supple), and oval (flat shape but bluntly pointed). Red sable brushes are generally utilised for a smoother, more delicate type of brushstroking. The painting knife, a finely tempered, thin version of the palette knife, is a useful method for painting oil colours in a robust style.
The standard support for oil paintings is a canvas manufactured from pure European linen of strong close weave. This canvas is cut to the necessary size and cast over a frame, mostly wood, to which it is secured with tacks or, during the 20th century, by use of staples. If the artist wants to reduce the absorbency of the canvas fabric itself and to create a consistent surface, a primer or ground might be applied and allowed to dry before painting begins. The most commonly found primers have been gesso, rabbit-skin glue, and lead white. If stiffness and a consistent texture are preferred rather than elasticity and texture, a wooden or processed paperboard panel, sized or primed, may be utilised. Lots of other supports, such as paper and certain textiles and metals, have also been experimented with.
A finish of paint varnish is often set on to a finished oil painting to prevent atmospheric attacks, minor abrasions, or harmful accumulation of dirt. This picture varnish can be removed without damage by experts with use of isopropyl alcohol and such household solvents. The painting varnish also brings the surface to a consistent lustre and takes the depth of tone and colour intensity essentially to the vibrancy initially seen by the artist in wet paint. Some modern painters, particularly those who don’t favour deep, intense colouring, and stay with a mat, or lustreless, finish in the paintings.
The majority of oil paintings created before the 19th century were built up in layers. The first layer was a blank, uniform field of thin paint known as a ground. The ground subdued the white gleam of the primer and formed a base of colour on which to apply the paint. The shapes and figures in the painting were roughly blocked in using shades of white, and gray or neutral green, red, or brown. The resulting field of monochromatic light and dark colours were called the underpainting. Forms could be given definition using either solid paint or scumbles; irregular, thinly applied layers of opaque pigment that can display a whole lot of pictorial effects. In the final stage, transparent layers of pure colour called glazes could be applied to create luminosity, depth, and brilliance to the figures, and highlights were defined with thick, textured patches of paint called impastos.
Oil as a painting medium is dated as early as the 11th century. The practice of easel painting with oil colours, however, stems directly from 15th-century tempera-painting methods. Basic improvements in the method of refining linseed oil and the availability of volatile solvents post 1400 coincided with a need for mediums other than pure egg-yolk tempera, to meet the changing needs of the Renaissance (see tempera painting). Initially, oil paints and varnishes had been employed to glaze tempera panels that were painted with the usual linear draftsmanship. The technically gleaming, crystal-like portraits by the 15th-century Flemish painter Jan van Eyck, for example, were done in this new way.
In the 16th century, oil colour flourished as the fundamental painting material in Venice. By the 17th century, Venetian artists were proficient in the use of the fundamental aspects of oil painting, particularly in applying successive layers of glaze. Canvas of linen, after a long period of growth, topped wood panels as the common support.
One of the 17th-century masters of the oil technique was Velazquez, a Spanish painter in the Venetian tradition, whose highly economical but sure brushstrokes have commonly been adopted, particularly in portraiture. The Flemish painter Peter Paul Rubens challenged tradition in the style in which he loaded light colours opaquely, juxtaposing the thin, transparent darks and shadows. A third notable 17th-century master of oil painting was the Dutch painter Rembrandt. In his pieces, a single brushstroke can effectively depict form; cumulative strokes give great textural depth, combining the rough and the smooth, the thick and the thin. A system of loaded whites and transparent darks was further enhanced by glazed effects, blendings, and highly controlled impastos.
Other notable influences on the later easel painting techniques are the smooth, thinly painted, deliberately planned, tight appearances. A great many admired works (e.g., those from Johannes Vermeer) were formed with smooth blends of tones to achieve shadowy forms and delicate colour variations.
The technical requirements of some schools of modern painting cannot be achieved by traditional genres and/or techniques, however. Some abstract painters – and to some extent contemporary painters in traditional styles – have demonstrated a need for a different plastic flow or viscosity that cannot be formed with oil paint and its conventional additives. Some require a wider variation of thick and/or thin applications and a expedient rate of drying. Some of them mixed coarsely grained materials with colours to create textures, some of them have used oil paints in greater volume than usual, and lots have begun using acrylic paints, which are more versatile and dry very fast.
Interested in oil painting? For art supplies Brisbane, including canvas art supplies and artists supplies, visit or call the Discount Art Warehouse.
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