Artists’ oil colours are created by stirring dry powder pigments with special refined linseed oil until it reaches a stiff paste thickness then grinding it by strong friction in steel roller mills. The smoothness of the hue is fundamental. The usual feel is a smooth, buttery paste, not stringy or long or tacky. When a flowing or mobile quality is required by the artist, a liquid painting medium like pure gum turpentine needs to be mixed with the substance. If the artist wishes to speed up drying, a siccative, or liquid drier, is commonly used.
First-rate brushes are manufactured in two styles: red sable (from various members of the weasel family) and bleached hog bristles. They can be purchased in numbered sizes for any of four regular shapes: round (pointed), flat, bright (flat shape but is shorter and less supple), and oval (flat but bluntly pointed). Red sable brushes are widely utilised for smoother, less robust type of brushstroke. The painting knife, a finely tempered, thin version of the palette knife, is a convenient item for painting oil colours in a robust way.
The usual support for an oil painting is a canvas of pure European linen of stable close weave. This canvas is cut to the desired size and pulled over a frame, often wood, and secured by use of tacks or, from the 20th century, by use of staples. To lower the absorbency of the fabric and attain a consistent surface, a primer or ground can be applied and is left to dry first. The most typically found primers have been gesso, rabbit-skin glue, and lead white. If stiffness and smoothness are preferred to springiness and texture, a wooden or processed paperboard panel, sized or primed, can be utilised. Other supports, for example paper and varying textiles and metals, also have been experimented with.
A layer of painting varnish is often put on to a completed oil painting to protect it from atmospheric attacks, minor abrasions, and harmful accumulation of dirt. This paint varnish may be removed safely by experts who use isopropyl alcohol and such common solvents. Varnishing also brings the surface to a consistent lustre and brings the tone depth and colour intensity really to the level originally seen by the artist in the wet paint. Some contemporary painters, particularly those who do not favour deep, intense colouring, and stay with a mat, or lustreless, finish in their oil paintings.
The majority of oil paintings from before the 19th century were built in layers. The first would be a blank, uniform field of thinned paint known as a ground. The ground lessened the gleaming white of the primer and established a gentle base of colour on which to build images. The forms and figures in the painting were roughly blocked in by using shades of white, along with gray or neutral green, red, or brown. The ultimate field of monochromatic light and dark colours were called the underpainting. Forms would be further defined using either paint or scumbles; irregular, thinly applied layers of opaque pigment that creates a whole lot of effects. In the final point, transparent layers of pure colour known as glazes were then used to impart luminosity, depth, and brilliance to the objects, and highlights would be imparted with thick, textured patches of paint called impastos.
Oil as a medium of painting is recorded circa the 11th century. The method of easel painting with oil colours, however, resulted directly from 15th-century tempera-painting styles. Basic improvements in the refining of linseed oil and the availability of volatile solvents post 1400 coincided with a need for a medium other than pure egg-yolk tempera, meeting the changing requirements of the Renaissance (see tempera painting). At first, oil paints and varnishes would be used to glaze tempera panelswhich had been painted in the usual linear draftsmanship. The technically vibrant, crystal-like works by the 15th-century Flemish artist Jan van Eyck, for example, were finished in this new way.
In the 16th century, oil paint emerged as the fundamental painting material in Venice. At the beginning of the 17th century, Venetian artists were proficient in the exploitation of the essential elements of oil painting, notably in their employment of successive layers of glazes. Canvas of linen, after a long period of development, overcame wooden panels as the most commonly used support.
One of the 17th-century masters of the oil technique was Velazquez, a Spanish painter in the Venetian tradition, whose supremely economical but certain brushstrokes have frequently been repeated, especially in portraiture. The Flemish painter Peter Paul Rubens challenged tradition in the style in which he loaded his light colours opaquely, juxtaposing his thin, transparent darks and shadows. A third great 17th-century master of oil painting was the Dutch painter Rembrandt. In his art, a single brushstroke would effectively depict form; cumulative strokes create great textural depth, with a combination of the rough and the smooth, the thick and the thin. A system of loaded whites and transparent darks was then enhanced by glazed effects, blendings, and highly controlled impastos.
Other particular influences on the later easel painting techniques are the smooth, thinly painted, deliberately planned, tight qualities. A great many admired works (e.g., like from Johannes Vermeer) were executed with smooth gradations and blends of colours to create subtly modeled forms and delicate colour variations.
The technical requirements of some schools of modern painting cannot be realized by traditional genres and/or techniques, however, and many abstract painters – including some modern traditionally-geared painters – have expressed a desire for a plastic flow or viscosity that cannot be created from oil paint and its conventional additives. Some need a greater variety of thick and thin applications and a more rapid rate of drying. Some artists have mixed coarsely grained substances with their colours to create texture, some artists use oil paints in much greater thickness than traditionally, and a large part have begun using acrylic paints, as they are more versatile and dry rapidly.
Interested in oil painting? For art supplies Brisbane, including canvas art supplies and artists supplies, visit or call the Discount Art Warehouse.