Artists’ oil colours are put together by adding dry powder pigments with selected refined linseed oil until the mixture reaches a stiff paste consistency and grinding it by powerful friction in steel roller mills. The smoothness of the colour is fundamental. The usual feel is a smooth, buttery paste, and not stringy or long or tacky. When a flowing or mobile aspect is desired by the artist, a liquid painting medium such as pure gum turpentine needs to be added with the mixture. To speed up drying, a siccative, or liquid drier, should be commonly used.
Top-grade brushes are available in two types: red sable (with hair from varying members of the weasel species) and chemically whitened hog bristles. They both are sold in in numbered sizes for each of four regular shapes: round (pointed), flat, bright (flat but shorter and less supple), and oval (flat but is bluntly pointed). Red sable brushes are commonly utilised for a smoother, delicate style of painting. The painting knife, a declicately tempered, skinny version of a palette knife, is a common utensil for painting oil colours in a robust way.
The standard support for oil paintings is a canvas made of pure European linen of strong close weave. The canvas is cut to the desired size and pulled over a frame, commonly made of wood, to which it is secured by use of tacks or, from the 20th century, by use of staples. If the artist wants to lessen the absorbency of the fabric itself and attain a smooth surface, a primer or ground should be applied and given time to dry before painting begins. The most often utilised primers for this are gesso, rabbit-skin glue, and lead white. If density and a consistent texture are preferred rather than elasticity and texture, a wooden or processed paperboard panel, sized or primed, may be utilised. Many other supports, such as paper and differing textiles and metals, have been tried out.
A coat of painting varnish is usually set on to a finished oil painting to prevent any atmospheric attacks, minor abrasions, or harmful accumulation of dirt. This film of varnish could be removed safely by experts with isopropyl alcohol and such household solvents. The painting varnish also brings the surface to a full lustre and sets the depth of tone and colour intensity essentially to the vibrancy first formed by the artist in wet paint. Some painters, particularly those who don’t favour deep, intense colouring, will stick with a mat, or lustreless, finish in the oil paintings.
Most oil paintings created previous to the 19th century were created in layers. The first was a blank, uniform field of thin paint called a ground. The ground lessened the white gleam of the primer and formed a gentle base of colour on which to start painting. The shapes and items in the painting would then be roughly blocked in with shades of white, and gray or neutral green, red, or brown. The ultimate mass of monochromatic light and dark were termed the underpainting. Forms could be further defined with either ordinary paint or scumbles, which are irregular, thinly applied layers of opaque pigment that imparts a lot of visual effects. In the completion step, transparent layers of pure colour known as a glaze would be applied to impart luminosity, depth, and brilliance to the figures, and highlights could then be imparted with thick, textured patches of paint known as impastos.
Oil as a painting medium is dated back to the 11th century. The practice of easel painting with oil colours, however, resulted directly from 15th-century tempera-painting styles. Simple improvements in the process of refining linseed oil and the availability of volatile solvents after 1400 coincided with a desire for a medium other than pure egg-yolk tempera, to meet the developing needs of the Renaissance (see tempera painting). At first, oil paints and varnishes were used to glaze tempera panels that had been painted with their traditional linear draftsmanship. The technically vibrant, gem-like works of the 15th-century Flemish painter Jan van Eyck, for example, were perfected with this new technique.
Throughout the 16th century, oils flourished as the fundamental painting material in Venice. From then, Venetian artists were proficient in the exploitation of the fundamental traits of oil painting, particularly in employing a number of layers of glazing. Canvas of linen, after a long time of growth, overcame wood panelling as the preferred 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 frequently been adopted, particularly in portraiture. The Flemish painter Peter Paul Rubens challenged the norm in the manner in which he loaded the light colours opaquely, in juxtaposition to his thin, transparent darks and shadows. The third notable 17th-century master of oil painting was the Dutch painter Rembrandt. In his paintings, a single brushstroke would effectively depict form; cumulative strokes created great textural depth, with a combination of the rough and the smooth, the thick and the thin. A field of loaded whites and transparent darks is fully enhanced by glaze, blendings, and highly controlled impastos.
Other particular influences on the techniques of easel painting are the smooth, thinly painted, deliberately planned, tight appearances. A great many admired works (e.g., those from Johannes Vermeer) were executed with smooth blends of tones to achieve shadowy forms and delicate colour variations.
The technical requirements of some schools of modern painting cannot be attained by use of traditional genres and techniques, however. Some abstract painters – including to some extent modern traditionally-geared painters – have expressed a need for an entirely different plastic flow or viscosity that cannot be had from oil paint and its conventional additives. Some require a larger range of thick and/or thin applications and a more rapid rate of drying. Some artists mix coarsely grained substances with the colours to create new textures, some of them used oil paints in greater thicknesses than traditionally, and many have started using acrylic paints, as they are more versatile and dry speedily.
Interested in oil painting? For art supplies Brisbane, including canvas art supplies and artists supplies, visit or call the Discount Art Warehouse.