Lithography : what exactly is it?
Lithography is a printing technique which is to create or reproduce multiple copies of a path executed in ink or pencil on a limestone. This technique is based on the principle of repulsion between water and fat.
The term lithography indicates the technique and the work obtained by this process. This technique has an important place in the work of Claude Weisbuch.
The lithograph should not be confused with lithogravure the lithograph, which is to burn stone plates. This technique is relatively little used to produce prints. It is essentially a process that allows electronic components. Compared to the techniques of engraving, lithography success to its ease of implementation.
Indeed, the artist can draw on the stone as he used to do on paper. There is essentially a technical constraint: draw by reversing the right and the left and also the use of different colours.
The lithographic stone
Support of excellence of the lithography is very fine-grained limestone. This grain must be perfectly homogeneous and no defects. Indeed, an imperfection can weaken the stone and lead to cracks, making it unfit to print.
Printing lithographic matrices generally a thickness of 7 to 10 centimeters. The two sides must be perfectly parallel. The surface is sanded, grained or polished using abrasives, SOAP and water. A smooth stone provides features and deep solids; a rough stone print in halftones.
Treated well, a lithographic stone can be kept for a long time and be removed several times. Indeed year due to cost, it is common to remove by polishing composition and reuse the stone. It is essential that the surface is maintained of all traces of fat.
The route runs directly on the stone in pencil or lithographic ink, pen or brush. The use of lithographic ink allows for the effects of wash. We can scrape some parts of the drawing to make it appear white deep (Daumier much used this technique). Can also be a postponement of a drawing by a layer or a “transfer paper.
The artist or craftsman must ensure not to put his hand on the surface of the stone, in order to not deposit fat, that would appear in the draw.
In order to be able to print, the composition must be fixed in stone. To do this, it is chalked and covered with a mixture of acid and gum.
Once the route has been executed, the stone is moistened for printing; being porous, the limestone holds water. The greasy ink is then put through a rubber roller. The ink remains on the stone to places imbued with the fat of the drawing while she is repelled by moisture everywhere else (the oily ink is hydrophobic).
When the stone is enough inked, put it on paper, and then press.
To print in color, you must start the printing of the same sheet, on a different stone. Indeed on each stone the ground is drawn taking into account its color, and overlays that will give mixed tints. The challenge is to identify the position of the sheet on the successive stones. Indeed, the moist sheet tends to undergo dimensional variations. We usually begins with lighter shades, ending with the darkest, usually black.
According to other techniques, a single stone is used in preparing the stone and by are redrawing each new color, based on the “ghost image” of the first drawing that remains on the stone. In this case, can’t make a new draw, the stone having been changed for each successive color.
Assessment of the draw
The value of a lithography depends on the number drawn copies, on the rating of the artist and the involvement of the artist during the draw. Depending on the case, the lithographies are carried out directly by the artist or may be the interpretation by a lithographer of a pre-existing work.
The first copy validated by the artist at the exit of the press is annotated “Fighting” (for “good shooting”). Before being numbered and signed by the artist, each copy is compared to the BAT. A few copies are annotated “EA” (“artist’s proof”) and “HC” (‘off-trade’) these copies are reserved for the artist and the printer.
Therefore, it is necessary to inform buyers, scoring on each draw, with the signature of the artist, the copy number and total circulation, which is called “justification of the draw.” For limited editions, once the number of copies is obtained, the stones are processed and polished.
The drawing had totally disappeared, this ensures the regularity of the official draw. The stones can be reused indefinitely once they are polished and processed properly.
The invention of lithography would be due to a combination of circumstances. In 1796, Aloys Senefelder can’t find a Publisher for his scores and decides to burn them himself. Due to the price of copper, it folds down on a stone, tender and smooth. He discovers that the action of an acid on the stone, creates a form in very low relief, usable for printing.
He will later discover the principle current lithography, based on the repulsion of water by the fat.
His method is used primarily to print sheet music, usually carved in intaglio. However, the Senefelder technique is much more economical.
Lithography became popular at the beginning of the 19ᵉ century with the publication of collections illustrating travel accounts corresponding to the ‘invention’ of tourism.
In 1839, the lithographic printing in color becomes popular.
End of the 19ᵉ and at the beginning of the 20ᵉ century, advertising is the process used. Produces collectible images, calendars, or all sorts of chromos. Furthermore, artists like Toulouse-Lautrec and Géricault, Bonington, left an abundant production.
In the middle of the same century, the woodcuts of Épinal imagery give way to lithographs. During the 20ᵉ century, lithography will be used as an advertising medium, for, in particular, the realization of posters. Highest rated are those created by the artists such as Miró, Picasso, Rebeyrolles.
While the word “lithography” means a technique based on the stone, this support could be quickly replaced by metal plates without radically changing the technique. A recent application, called kitchen litho, even using household aluminum and current products, non-toxic, for educational purposes.