Archive for April, 2011

Solarplate etching is a new alternative to traditional metal plate etching, which does not require the use of grounds and acids. Solarplate is a light sensitized steel backed polymer material used by artisits as an alternative to hazardous printing techniques. It’s a simple, safer, and faster approach than traditional etching and relief printing.

Step one: prepare artwork

Artwork may be created with liquid opaque paint or ink, light-stopping making devices, rubylith films, lithographic crayons and certain black pencils, or found objects. The image is created on transparent acetate, mylar, Xerox or a glass surface. This “transparency” is used as a contact positive or negative for either intaglio or relief. Artwork can be created by hand drawing,
computer printout, or with photographic methods.

Step two: expose plate to UV light

When exposing with the sun, set up your Solarplate indoors, and away from direct sunlight. Sandwich the plate and transparency between thick plate glass  with a rigid board. Clamp the entire unit together and expose it to the sun, or artificial U.V. light source, perpendicular to the rays.
Best results are achieved at noontime in strong sunlight, an average time would be 90 seconds in the summer in northeast United States.
Once the plate has been exposed, bring the entire unit indoors. The exposure is repeated however the time may differ.
NOTE: The darker or more dense the transparency—the longer the exposure; The lighter or more delicate the transparency—the shorter the exposure. Times can vary from 3 minutes down to 15 seconds.

Step three: rinse plate in water

WASH OUT (etching)

The washout process is a substitution for the “etch” process In traditional Intaglio. Sixty-eight degree water is used instead of acid. Gently, scrub the entire image with a soft nylon scrub brush for about two minutes or longer. During the washout, the protected areas will be removed from the surface, creating an intaglio surface. You can control the washing time and stop at any desired moment. After completing the washout, quickly blot with newsprint or phone book pages.

Step four: harden plate

Post Expose the plate for 5-10 minutes; longer post exposure will not harm the image

Step five: filing the plate

Before inking, eliminate the sharp corners of the plate with a file.

Step six: print plate

Printing may be done in either relief or intaglio. Plate thickness is less than standard zinc or copper and presses should be adjusted accordingly. Although hand printing may be accomplished by traditional rubbing techniques, a press is more desirable for ease, consistency and quality. Any quality printmaking paper may be used.

GEORGE ROBERTS developed Polyester Plate Lithography, a new and nontoxic form of lithographic printing while he was Professor of Printmaking at Boise State University. George sadly died in 2001.

The process is more straightforward than conventional lithography as the plate does not require chemical processing in the form of etching with nitric acid etc. Some print shops still use fountain solution and strong acids for printing and processing. The most common problem encountered when printing a polyester plate is “scumming”, when the plate starts picking up ink in areas where it is not wanted.

The clarity of the print is largely determined by the consistency of the ink. An ink that is too soft and viscous (oily) will result in smudging, while a very stiff ink gives a crisp mark, but makes a heavier demand on the durability of the plate. An overly stiff ink may even rip toner marks or other drawing media off the plate during rolling up. As a remedy, use a softer ink and ensure an amount of heat curing before printing. As most of the drawing media used in Polyester Plate Litho are akin to the materials used in ACRYLIC RESIST ETCHING, many of the requirements are similar. Acrylics like heat to aid polymerization, and the new litho process is no exception.

Lindsey Strawn rolling up a pronto plate, Columbia College Chicago

Bernadeta Szopinska. Polyester plate lithograph made using a range of oil and litho crayons, Sharpie, ballpoint pen, and acrylic wash media
Columbia College Chicago, 2008

Laura Shields, polyester plate lithograph

Collography (sometimes misspelled “collagraphy“) is a printmaking process in which materials are applied to a rigid substrate (such as cardboard or wood). The word is derived from the Greek word koll or kolla, meaning glue and graph.

The plate can be intaglio-inked, inked with a roller or paintbrush, or some combination thereof. Ink or pigment is applied to the resulting collage, and the board is used to print onto paper or another material using either a printing press or various hand tools. The resulting print is termed a collagraph. Substances such as carborundum, acrylic texture mediums, sandpapers, string, cut card, leaves and grasses can all be used in creating the collograph plate. In some instances, leaves can be used as a source of pigment by rubbing them onto the surface of the plate.

Different tonal effects and vibrant colours can be achieved with the technique due to the depth of relief and differential inking that results from the collograph plate’s highly textured surface. Collography is a very open printmaking method. Ink may be applied to the upper surfaces of the plate with a brayer for a relief print, or ink may be applied to the entire board and then removed from the upper surfaces but remaining in the spaces between objects, resulting in an intaglio print. A combination of both intaglio and relief methods may also be employed. A printing press may or may not be used.