Lithography (from
Greek ''
λίθος'' - ''lithos'', 'stone' + ''
γράφειν'' - ''graphein'', 'to write') is a method for
printing using a stone (
lithographic limestone) or a metal plate with a completely smooth surface. Invented in
1796 by Bavarian author
Alois Senefelder as a low-cost method of publishing theatrical works, lithography can be used to print text or
artwork onto paper or another suitable material.
Introduction
Lithography originally used an image drawn (etched) into a coating of wax or an oily substance applied to a
plate of lithographic stone as the medium to transfer
ink to the blank
paper sheet, and so produce a
printed page. In modern lithography, the image is made of a
polymer coating applied to a flexible aluminum plate. To print an image lithographically, the flat surface of the stone plate is (slightly) roughened — etched — and divided into
hydrophilic regions that accept a film of water, and thereby repel the greasy ink; and
hydrophobic regions that repel water and accept ink because the
surface tension is greater on the greasy image area, which remains dry. The image can be printed directly from the stone plate (the orientation of the image is reversed), or it can be
offset, by transferring the image onto a flexible sheet (rubber) for printing and publication.
As a printing technology, lithography is different from intaglio printing (gravure), wherein a plate is either engraved, etched, or stippled to score cavities to contain the printing ink; and woodblock printing, and letterpress printing, wherein ink is applied to the raised surfaces of letters or images. Most types of books of high-volume text are printed with offset lithography, the most common form of printing technology. Etymologically, the word lithography also denotes photolithography, a microfabrication technique used to make integrated circuits and microelectromechanical systems, as such are more technologically akin to etching than lithography, printing from a stone plate.
The principle of lithography
Lithography uses simple chemical processes to create an image. For instance, the positive part of an image is a
hydrophobic, or "water hating" substance, while the negative image would be
hydrophilic or "water loving". Thus, when the plate is introduced to a compatible printing ink and water mixture, the ink will adhere to the positive image and the water will clean the negative image. This allows a flat print plate to be used, enabling much longer and more detailed print runs than the older physical methods of printing (e.g.,
intaglio printing,
Letterpress printing).
Lithography was invented by Alois Senefelder in Bohemia in 1796. In the early days of lithography, a smooth piece of limestone was used (hence the name "lithography"—"lithos" (λιθος) is the ancient Greek word for stone). After the oil-based image was put on the surface, a solution of gum arabic in water was applied, the gum sticking only to the non-oily surface. During printing, water adhered to the gum arabic surfaces and avoided the oily parts, while the oily ink used for printing did the opposite.
Lithography on limestone
Lithography works because of the mutual repulsion of oil and water. The image is drawn on the surface of the print plate with a fat or oil-based medium (hydrophobic) such as a wax crayon, which may be pigmented to make the drawing visible. A wide range of oil-based media is available, but the durability of the image on the stone depends on the
lipid content of the material being used, and its ability to withstand water and acid. Following the drawing of the image, an aqueous
solution of
gum arabic, weakly acidified with nitric acid is applied to the stone. The function of this solution is to create a hydrophilic layer of calcium nitrate salt, , and gum arabic on all non-image surfaces. The gum solution penetrates into the pores of the stone, completely surrounding the original image with a hydrophilic layer that will not accept the printing ink. Using lithographic
turpentine, the printer then removes any excess of the greasy drawing material, but a hydrophobic molecular film of it remains tightly bonded to the surface of the stone, rejecting the gum arabic and water, but ready to accept the oily ink.
When printing, the stone is kept wet with water. Naturally the water is attracted to the layer of gum and salt created by the acid wash. Printing ink based on drying oils such as linseed oil and varnish loaded with pigment is then rolled over the surface. The water repels the greasy ink but the hydrophobic areas left by the original drawing material accept it. When the hydrophobic image is loaded with ink, the stone and paper are run through a press which applies even pressure over the surface, transferring the ink to the paper and off the stone.
Senefelder had experimented in the early 19th century with multicolor lithography; in his 1819 book, he predicted that the process would eventually be perfected and used to reproduce paintings. Multi-color printing was introduced through a new process developed by Godefroy Engelmann (France) in 1837 known as chromolithography. A separate stone was used for each color, and a print went through the press separately for each stone. The main challenge was of course to keep the images aligned (''in register''). This method lent itself to images consisting of large areas of flat color, and led to the characteristic poster designs of this period.
The modern lithographic process
High-volume lithography is used today to produce posters, maps, books, newspapers, and packaging—just about any smooth, mass-produced item with print and graphics on it. Most books, indeed all types of high-volume text, are now printed using offset lithography.
In offset lithography, which depends on photographic processes, flexible aluminum, polyester, mylar or paper printing plates are used in place of stone tablets. Modern printing plates have a brushed or roughened texture and are covered with a photosensitive emulsion. A photographic negative of the desired image is placed in contact with the emulsion and the plate is exposed to ultraviolet light. After development, the emulsion shows a reverse of the negative image, which is thus a duplicate of the original (positive) image. The image on the plate emulsion can also be created through direct laser imaging in a CTP (Computer-To-Plate) device called a platesetter. The positive image is the emulsion that remains after imaging. For many years, chemicals have been used to remove the non-image emulsion, but now plates are available that do not require chemical processing.
The plate is affixed to a cylinder on a printing press. Dampening rollers apply water, which covers the blank portions of the plate but is repelled by the emulsion of the image area. Ink, which is hydrophobic, is then applied by the inking rollers, which is repelled by the water and only adheres to the emulsion of the image area—such as the type and photographs on a newspaper page.
If this image were directly transferred to paper, it would create a mirror image and the paper would become too wet. Instead, the plate rolls against a cylinder covered with a rubber ''blanket'', which squeezes away the water, picks up the ink and transfers it to the paper with uniform pressure. The paper rolls across the blanket drum and the image is transferred to the paper. Because the image is first transferred, or ''offset'' to the rubber drum, this reproduction method is known as ''offset lithography'' or ''offset printing''.
Many innovations and technical refinements have been made in printing processes and presses over the years, including the development of presses with multiple units (each containing one printing plate) that can print multi-color images in one pass on both sides of the sheet, and presses that accommodate continuous rolls (''webs'') of paper, known as web presses. Another innovation was the continuous dampening system first introduced by Dahlgren instead of the old method which is still used today on older presses (conventional dampening), which are rollers covered in molleton (cloth) which absorbs the water. This increased control over the water flow to the plate and allowed for better ink and water balance. Current dampening systems include a "delta effect or vario " which slows the roller in contact with the plate, thus creating a sweeping movement over the ink image to clean impurities known as "hickies".
The advent of desktop publishing made it possible for type and images to be manipulated easily on personal computers for eventual printing on desktop or commercial presses. The development of digital imagesetters enabled print shops to produce negatives for platemaking directly from digital input, skipping the intermediate step of photographing an actual page layout. The development of the digital platesetter in the late 20th century eliminated film negatives altogether by exposing printing plates directly from digital input, a process known as computer to plate printing.
Microlithography and nanolithography
Microlithography and nanolithography refer specifically to lithographic patterning methods capable of structuring material on a fine scale. Typically features smaller than 10 micrometers are considered microlithographic, and features smaller than 100 nanometers are considered nanolithographic. Photolithography is one of these methods, often applied to semiconductor manufacturing of microchips. Photolithography is also commonly used in fabricating MEMS devices. Photolithography generally uses a pre-fabricated photomask or reticle as a master from which the final pattern is derived.
Although photolithographic technology is the most commercially advanced form of nanolithography, other techniques are also used. Some, for example electron beam lithography, are capable of much higher patterning resolution (sometime as small as a few nanometers). Electron beam lithography is also commercially important, primarily for its use in the manufacture of photomasks. Electron beam lithography as it is usually practiced is a form of maskless lithography, in that no mask is required to generate the final pattern. Instead, the final pattern is created directly from a digital representation on a computer, by controlling an electron beam as it scans across a resist-coated substrate. Electron beam lithography has the disadvantage of being much slower than photolithography.
In addition to these commercially well-established techniques, a large number of promising microlithographic and nanolithographic technologies exist or are emerging, including nanoimprint lithography, interference lithography, X-ray lithography, extreme ultraviolet lithography, magnetolithography and scanning probe lithography. Some of these emerging techniques have been used successfully in small-scale commercial and important research applications.
Surface-charge lithography, in fact Plasma desorption mass spectrometry can be directly patterned on polar dielectric crystals via pyroelectric effect,
Diffraction lithography.
Lithography as an artistic medium
During the first years of the 19th century, lithography made only a limited impact on
printmaking, mainly because technical difficulties remained to be overcome. Germany was the main center of production during this period.
Godefroy Engelmann, who moved his press from
Mulhouse to Paris in 1816, largely succeeded in resolving the technical problems, and in the 1820s lithography was taken up by artists such as
Delacroix and
Géricault. London also became a center, and some of Géricault's prints were in fact produced there.
Goya in Bordeaux produced his last series of prints in lithography—''The Bulls of Bordeaux'' of 1828. By the mid-century the initial enthusiasm had somewhat died down in both countries, although lithography continued to gain ground in commercial applications, which included the great prints of
Daumier, published in newspapers.
Rodolphe Bresdin and
Jean-Francois Millet also continued to practice the medium in France, and
Adolf Menzel in Germany.
In 1862 the publisher Cadart tried to launch a portfolio of lithographs by various artists which flopped, but included several superb prints by
Manet. The revival began in the 1870s, especially in France with artists such as
Odilon Redon,
Henri Fantin-Latour and
Degas producing much of their work in this way. The need for strictly limited
editions to maintain the price had now been realized, and the medium become more accepted.
In the 1890s color lithography became enormously popular with French artists, Toulouse-Lautrec most notably of all, and by 1900 the medium in both color and monotone was an accepted part of printmaking, although France and the US have used it more than other countries.
During the 20th century, a group of celebrated artists, including Calder, Chagall, Dufy, Léger, Matisse, Miró, and Picasso, rediscovered the largely unexplored art form of lithography thanks to the Mourlot Studios, also known as ''Atelier Mourlot'', a Parisian printshop founded in 1852 by the Mourlot family. The Atelier Mourlot originally specialized in the printing of wallpaper, but was transformed when the founder's grandson, Fernand Mourlot, invited a number of 20th-century artists to explore the complexities of fine art printing. Fernand encouraged the painters to work directly on lithographic stones in order to create original artworks that could then be executed under the direction of master printers in small editions. The combination of modern artist and master printer gave rise to unique and visually striking lithographs, which were used as posters to promote the artists' work.
Grant Wood, George Bellows, Alphonse Mucha, Max Kahn, Pablo Picasso, Eleanor Coen, Jasper Johns, David Hockney, Susan Dorothea White and Robert Rauschenberg are a few of the artists who have produced most of their prints in the medium. M.C. Escher is considered a master in lithography, and many of his prints were created using this process. More than other printmaking techniques, printmakers in lithography still largely depend on access to a good printer, and the development of the medium has been greatly influenced by when and where these have been established. See the List of Printmakers for more practitioners.
As a special form of lithography, the ''Serilith'' process is sometimes used. Serilith are mixed media original prints created in a process where an artist uses the lithograph and serigraph process. The separations for both processes are hand drawn by the artist. The serilith technique is used primarily to create fine art limited print editions.
Gallery
See also
Block printing
Color printing
Etching
Flexography
History of graphic design
Letterpress printing
Lineography
Photochrom
Rotogravure
Seriolithograph
Stereolithography
Typography
Lithography using MeV ions - Proton Beam Writing
References
External links
Lithography and other printmaking definitions
Museum of Modern Art information on printing techniques and examples of prints
The Invention of Lithography, Aloys Senefelder, (Eng. trans. 1911)''(a searchable facsimile at the University of Georgia Libraries; DjVu and layered PDF format)''
Theo De Smedt's website, author of ''"What's lithography"''
Extensive information on Honoré Daumier and his life and work, including his entire output of lithographs
Digital work catalog to 4000 lithographs and 1000 wood engravings
Detailed examination of the processes involved in the creation of a typical scholarly lithographic illustration in the 19th century
Nederlands Steendrukmuseum
Delacroix's ''Faust'' lithographs at the Davison Art Center, Wesleyan University
A brief historic overview of Lithography. University of Delaware Library. Includes citations for 19th century books using early lithographic illustrations.
Philadelphia on Stone: The First Fifty Years of Commercial Lithography in Philadelphia. Library Company of Philadelphia. Provides an historic overview of the commercial trade in Philadelphia and links to a biographical dictionary of over 500 Philadelphia lithographers and catalog of over 1300 lithographs documenting Philadelphia.
Swiss Cities
Category:Austrian inventions
Category:Communication design
Category:Greek loanwords
Category:Graphic design
Category:Lithography (microfabrication)
Category:Planographic printing
Category:Printmaking
ar:طباعة حجرية
bn:লিথোগ্রাফি
bs:Litografija
bg:Литография
ca:Litografia
cs:Litografie
da:Litografi
de:Lithografie
et:Litograafia
el:Λιθογραφία
es:Litografía
eo:Litografio
fa:چاپ سنگی
fr:Lithographie
gl:Litografía
ko:석판인쇄
hi:लिथो छपाई
hr:Litografija
id:Litografi
it:Litografia (arte)
he:הדפס אבן
lv:Litogrāfija
lb:Lithographie
lt:Litografija
hu:Litográfia
mr:लिथोग्राफ
nl:Lithografie
ja:リトグラフ
no:Litografi
nn:Litografi
pl:Litografia
pt:Litografia
ro:Litografie
ru:Литография
sq:Shtypi litografik
simple:Lithography
sk:Litografia
sl:Litografija
sr:Литографија
sh:Litografija
fi:Litografia
sv:Litografi
th:ภาพพิมพ์หิน
tr:Taş baskı
uk:Літографія
ur:سنگی طباعت
vi:In thạch bản
vls:Lithografië
zh:平版印刷