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Acrylic paint

Acrylic paint is fast-drying paint containing pigment suspended in an acrylic polymer emulsion. Acrylic paints can be diluted with water, but become water-resistant when dry. Depending on how much the paint is diluted (with water), the finished acrylic painting can resemble a watercolor or an oil painting.

Acrylics are sometimes used in place of watercolors because acrylics dry closer to the desired color (slightly darker, usually) while watercolors dry lighter (and often unpredictably, especially for beginning artists).

Acrylics are often used as an alternative to oil paints because acrylics dry much faster. Oil paints, which consist of pigment suspended in an oil (usually linseed, or other natural oil) base, can take a very long time to dry. Acrylic paints can achieve an oil-paint-like effect, and do so in much less time. Though applied to look like oil paints, acrylics are somewhat limited due to the superior color range of oil paints, and the fact that acrylic paints dry to a shiny, smooth (some say 'cartoonish') effect-not surprising since acrylic paints are, basically, plastic. Accordingly, acrylic paint can be removed with turpentine, mineral spirits (also known as white spirits), ammonia, or rubbing alcohol.

Acrylic painters modify the appearance, hardness, flexibility, texture, and other characteristics of the paint surface using acrylic mediums. Watercolor and oil painters also use mediums, but the range of acrylic mediums is much greater. Acrylics have the ability to bond to many different surfaces, and mediums can be used to adjust their binding characteristics. Mediums can change the sheen from gloss to matte, or can add iridescence or texture to the surface. They can also be used to build thick layers of paint: gel and molding paste mediums are sometimes used to create paintings with relief features that are literally sculptural.

Acrylic paintings, ideally, should be treated as if they're as different from oil paintings as are watercolors: they are their own artform. There are techniques which are available only to acrylic painters, as well as restrictions unique to acrylic painting. Therefore, judging an acrylic painting as though it were an oil painting (or a watercolor) is not always appropriate.

Airbrush

The airbrush is a small, highly precise spray gun for applying paint. It was invented in 1879 by Abner Peeler, in Iowa, USA. This first airbrush used a hand-operated compressor, and the inventor patented it "for the painting of watercolors and other artistic purposes". However this first device was rather crude and it took a number of years of further development before a practical device was developed, which was marketed by Liberty Walkup. The first modern type airbrush came along in 1893, presented by Thayer and Chandler art materials company at the World Columbian Exposition in Chicago, invented by Charles Burdick. This device looked like a pen and worked in a different manner to Peeler's device, being essentially the same as a modern airbrush. The most highly refined airbrushes today are manufactured in Japan, one of the most popular brands is Iwata.

An airbrush works by passing a stream of fast moving (compressed) air through a venturi, which creates a local reduction in air pressure (suction) that allows paint to be pushed up from an interconnected reservoir at normal atmospheric pressure. The high velocity of the air atomizes the paint into very tiny droplets as it blows past a very fine paint-metering component. The paint is carried onto paper or other surface. The operator controls the amount of paint using a variable trigger which opens more or less a very fine tapered needle that is the control element of the paint-metering component. An extremely fine degree of atomization is what allows an artist to create such smooth blending effects using the airbrush.

The technique allows for the blending of two or more colors in a seamless way, with one color slowly becoming another color. Freehand airbrushed images, without the aid of stencils or friskets, have a floating quality, with softly defined edges between colors, and between foreground and background colors. A well skilled airbrush artist can produce paintings of photographic realism or can simulate almost any painting medium. Painting at this skill level involves supplementary tools, such as masks and friskets, and very careful planning.

Airbrushing for photo retouching

Airbrushing has long been used to alter photographs in the pre-digital era. In skilled hands it can be used to help hide signs that an image has been extensively retouched or "doctored".

Many photographs of officials from the Stalinist regime show extensive airbrushing, often entire people have been removed. The term "airbrushed out" has come to mean rewriting history to pretend that something was never there.

The term "airbrushed" or "airbrushed photo" has also been used to describe glamour photos in which a model's imperfections have been removed, or in which their attributes have been enhanced. The term has often been applied in a pejorative manner to describe images of unealistic female perfection and has been particularly common in reference to pictures in Playboy magazine.

Using today's digital imaging technology, this kind of picture editing is now usually done with a bitmap graphics editor, which is capable of even more subtle work in the hands of a skilled touch-up artist. This technique is called photoshopping.

Spray guns

The airbrush led to the development of the spray gun, a larger, more industrial type of paint applicator used for larger areas. Airbrushing itself started being used on cars in the 1940s to make hot rods, specialty cars and then spread to the general car repainting industry.

 

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